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Tag Archives: Black Diamond Engagement Rings

Sep
07
2017

Men’s black diamond wedding rings

 

Men's Black Diamond Nautical Compass Ring 18k Rose Gold (0.25ct)

Awesome range of black diamond men’s rings – This handsome nautical compass ring features a brilliant cut round black diamond of SI1-SI2 clarity which is extremely vibrant and shiny. This 18k white gold ring is proudly handcrafted in the USA. From the Allurez Island Jewelry collection. Available from Allurez. Priced at (subject to change) $3037.90

In this post we focus on black diamond men’s rings, once again by Allurez .  As with the rings from previous posts, there are many high quality diamond rings to choose from. The images below showcase wedding bands and rings in white, yellow and rose gold in both 14k and 18k. Additionally black rhodium, sterling silver platinum and palladium is featured. All the items feature black diamonds in a variety of styles.

Of particular interest is the range of nautical compass rings.

The images feature a quote by Frank Sinatra – What I do with my life is of my own doing, I live it the best way I can. The theme of this post is aimed at independence of though and action. Enjoy!

 

Men’s Black Diamond Nautical Compass Ring 14k White Gold (0.25ct)

Awesome range of black diamond men's rings - This handsome nautical compass ring features a brilliant cut round black diamond of SI1-SI2 clarity which is extremely vibrant and shiny. This 14k white gold ring is proudly handcrafted in the USA. From the Allurez Island Jewelry collection. Available from Allurez. Priced at (subject to change) $2574.80Awesome range of black diamond men’s rings – This handsome nautical compass ring features a brilliant cut round black diamond of SI1-SI2 clarity which is extremely vibrant and shiny. This 14k white gold ring is proudly handcrafted in the USA. From the Allurez Island Jewelry collection. Available from Allurez. Priced at (subject to change) $2574.80

Black and White Diamond Wedding Ring Men’s Band 14k Yellow Gold (0.50ct)

Awesome range of black diamond men's rings. Wear it as a wedding band as an anniversary ring as a men's engagement ring or as a right hand fashion ring. Also available in other widths and precious metals. Available from Allurez. Priced at (subject to change) $1950.00

Awesome range of black diamond men’s rings – 40 brilliant-cut round black diamonds are accented by 8 brilliant-cut round white diamonds. These bright diamonds of G-H VS2 clarity are beautifully circling all the way around the ring and are set in an elegant channel-setting. This comfort-fit unique band for men features a satin finish making the unique colored diamond ring unlike any other. With about 10.1 grams of gold the ring is heavy in gold making it extremely valuable. Wear it as a wedding band as an anniversary ring as a men’s engagement ring or as a right hand fashion ring. Also available in other widths and precious metals. Available from Allurez. Priced at (subject to change) $1950.00

Men’s Black Diamond Channel Set Wedding Band 14k Rose Gold (0.49ct)

Awesome range of black diamond men's rings - Express your commitment to your SI1gnificant other with this striking channel set Men's black diamond ring wedding band. Available from Allurez. Priced at (subject to change) $1402.00Awesome range of black diamond men’s rings – Express your commitment to your SI1gnificant other with this striking channel set Men’s black diamond ring wedding band.There are 7 magnificent near-colorless round diamonds channel set of black color and SI1 clarity weighing a total of 0.49 carats. Made in stunning 14k rose gold and proudly crafted in the U.S.A this luxurious men’s wedding band can also be worn as a fashion ring. Available from Allurez. Priced at (subject to change) $1402.00

Men’s Black Onyx and Channel Set Diamond Ring Sterling Silver 0.10ct

Awesome range of black diamond men's rings - This handsome black onyx and diamond ring features 0.10 carats of diamond light emanating from three channel set diamonds.Awesome range of black diamond men’s rings – This handsome black onyx and diamond ring features 0.10 carats of diamond light emanating from three channel set diamonds.Crafted from .925 sterling silver this fashion ring for men features a genuine black onyx set on a slant with three channel set diamonds set in the same way next to it.Made to take him from work suits to weekend sweats this black onyx and diamond ring is perfect as a unique wedding band or a ring to be worn on the right hand. Available from Allurez. Priced at (subject to change) $255.00

Men’s Black Diamond Nautical Compass Ring 14k Yellow Gold (0.25ct)

Awesome range of black diamond men's rings - This handsome nautical compass ring features a brilliant cut round black diamondAwesome range of black diamond men’s rings – This handsome nautical compass ring features a brilliant cut round black diamond of SI1-SI2 clarity which is extremely vibrant and shiny. This 14k yellow gold ring is proudly handcrafted in the USA. From the Allurez Island Jewelry collection. Available from Allurez. Priced at (subject to change) $2574.80

Black and White Diamond Wedding Ring Men’s Band 14k White Gold (0.50ct)

Awesome range of black diamond men's rings - 40 brilliant-cut round black diamonds Awesome range of black diamond men’s rings – 40 brilliant-cut round black diamonds are accented by 8 brilliant-cut round white diamonds. These bright diamonds of G-H VS2 clarity are beautifully circling all the way around the ring and are set in an elegant channel-setting. This comfort-fit unique band for men features a satin finish making the unique colored diamond ring unlike any other. With about 10.10grams of gold the ring is heavy in gold making it extremely valuable. Wear it as a wedding band as an anniversary ring as a men’s engagement ring or as a right hand fashion ring. Also available in other widths and precious metals. Available from Allurez. Priced at (subject to change) $1950.00

Men’s Black Diamond Channel Set Wedding Band 14k Yellow Gold (0.49ct)

Awesome range of black diamond men's rings - Express your commitment to your SI1gnificant other with this striking channel set Men's black diamond ring wedding band.Awesome range of black diamond men’s rings – Express your commitment to your SI1gnificant other with this striking channel set Men’s black diamond ring wedding band.There are 7 magnificent near-colorless round diamonds channel set of black color and SI1 clarity weighing a total of 0.49 carats.Made in stunning 14k yellow gold and proudly crafted in the U.S.A this luxurious men’s wedding band can also be worn as a fashion ring. Available from Allurez. Priced at (subject to change) $1402.00

Men’s Black Diamond Ring Eternity Wedding Band 14k Yellow Gold (1.00ct)

Awesome range of black diamond men's rings - Crafted in stunning 14k yellow gold this Men's diamond ring wedding band is a handsome piece of jewelry.Awesome range of black diamond men’s rings – Crafted in stunning 14k yellow gold this Men’s diamond ring wedding band is a handsome piece of jewelry.There are 10 magnificent near-colorless round diamonds burnish set of black color and SI1 clarity weighing a total of 1.00 carat.This masculine diamond wedding band can also be worn as a fashion ring. Proudly crafted in the U.S.A this luxurious diamond wedding band is a ring you will cherish for a lifetime. Available from Allurez. Priced at (subject to change) $1950.00

0.86ct 14k White Gold Black Diamond Men’s Band

Awesome range of black diamond men's rings - Add sparkle to your style with this timeless black diamond ringAwesome range of black diamond men’s rings – Add sparkle to your style with this timeless black diamond ring which has an approximate weight of 0.86 ctw. It makes for a great anniversary birthday or weddings day gift. Available from Allurez. Priced at (subject to change) $1250.00

Men’s Black Diamond Nautical Compass Ring 14k Rose Gold (0.25ct)

Awesome range of black diamond men's rings - This handsome nautical compass ring features a brilliant cut round black diamond Awesome range of black diamond men’s rings – This handsome nautical compass ring features a brilliant cut round black diamond of SI1-SI2 clarity which is extremely vibrant and shiny. This 14k rose gold ring is proudly handcrafted in the USA. From the Allurez Island Jewelry collection. Available from Allurez. Priced at (subject to change) $2574.80

Men’s Black Diamond Channel Set Wedding Band 14k White Gold (0.49ct)

Awesome range of black diamond men's rings - Express your commitment to your SI1gnificant other with this striking channel set Men's black diamond ring wedding band.Awesome range of black diamond men’s rings – Express your commitment to your SI1gnificant other with this striking channel set Men’s black diamond ring wedding band.There are 7 magnificent near-colorless round diamonds channel set of black color and SI1 clarity weighing a total of 0.49 carats.Made in stunning 14k white gold and proudly crafted in the U.S.A this luxurious men’s wedding band can also be worn as a fashion ring. Available from Allurez. Priced at (subject to change) $1402.00

Men’s Black Diamond Ring Eternity Wedding Band 14k White Gold (1.00ct)

Awesome range of black diamond men's rings - Crafted in stunning 14k white gold this Men's black diamond ring wedding band is a handsome piece of jewelry.Awesome range of black diamond men’s rings – Crafted in stunning 14k white gold this Men’s black diamond ring wedding band is a handsome piece of jewelry.There are 10 magnificent near-colorless round diamonds burnish set of black color and SI1 clarity weighing a total of 1.00 carat.This masculine diamond wedding band can also be worn as a fashion ring. Proudly crafted in the U.S.A this luxurious diamond wedding band is a ring you will cherish for a lifetime. Available from Allurez. Priced at (subject to change) $1950.00

Men’s Black Diamond Ring Eternity Wedding Band 14k Rose Gold (1.00ct)

Awesome range of black diamond men's rings - Crafted in stunning 14k rose gold this Men's diamond ring wedding band is a handsome piece of jewelry.Awesome range of black diamond men’s rings – Crafted in stunning 14k rose gold this Men’s diamond ring wedding band is a handsome piece of jewelry.There are 10 magnificent near-colorless round diamonds burnish set of black color and SI1 clarity weighing a total of 1.00 carat.This masculine diamond wedding band can also be worn as a fashion ring. Proudly crafted in the U.S.A this luxurious diamond wedding band is a ring you will cherish for a lifetime. Available from Allurez. Priced at (subject to change) $1950.00

Men’s Channel Set Black Diamond Wedding Ring 14k White Gold (0.25ct)

Awesome range of black diamond men's rings - A simple men's wedding ring is traformed into a beautiful unique colored diamond ring featuring 10 round cut sparkling black diamonds.Awesome range of black diamond men’s rings – A simple men’s wedding ring is traformed into a beautiful unique colored diamond ring featuring 10 round cut sparkling black diamonds. The black diamonds are of VS Clarity and are set in a channel setting. The diamonds on this unique wedding band for men go half way around in a semi-eternity fashion. Available from Allurez. Priced at (subject to change) $1312.00

Men’s Black Diamond Nautical Compass Ring 18k White Gold (0.25ct)

Awesome range of black diamond men's rings - This handsome nautical compass ring features a brilliant cut round black diamond Awesome range of black diamond men’s rings – This handsome nautical compass ring features a brilliant cut round black diamond of SI1-SI2 clarity which is extremely vibrant and shiny. This 18k white gold ring is proudly handcrafted in the USA. From the Allurez Island Jewelry collection. Available from Allurez. Priced at (subject to change) $3037.90

Men’s Burnish-Set Black Diamond Wedding Ring 14k White Gold (0.40 ctw)

Awesome range of black diamond men's rings - Show him that he holds a special place in your heart with these men's burnish-set black diamond wedding bands.Awesome range of black diamond men’s rings – Show him that he holds a special place in your heart with these men’s burnish-set black diamond wedding bands. This wedding band is set in a beautiful 14k white gold setting. A total of round cut s totaling approximately cts. decorate the sides of the burnish set center stone in a classic fashion. Available from Allurez. Priced at (subject to change) $1540.00

Men’s Black Diamond Nautical Compass Ring 18k Yellow Gold (0.25ct)

Awesome range of black diamond men's rings - This handsome nautical compass ring features a brilliant cut round black diamond.Awesome range of black diamond men’s rings – This handsome nautical compass ring features a brilliant cut round black diamond of SI1-SI2 clarity which is extremely vibrant and shiny. This 18k yellow gold ring is proudly handcrafted in the USA. From the Allurez Island Jewelry collection. Available from Allurez. Priced at (subject to change) $3037.90

0.94ct 14k White Gold Black and White Diamond Men’s Ring Size 11

Awesome range of black diamond men's rings - Light up the room with this glamorous black diamond ringAwesome range of black diamond men’s rings – Light up the room with this glamorous black diamond ring which has an approximate weight of 0.94 ctw. It makes for a great anniversary birthday or weddings day gift. Available from Allurez. Priced at (subject to change) $1830.00

Men’s Black Diamond Nautical Compass Ring 18k Rose Gold (0.25ct)

Awesome range of black diamond men's rings - This handsome nautical compass ring features a brilliant cut round black diamond Awesome range of black diamond men’s rings – This handsome nautical compass ring features a brilliant cut round black diamond of SI1-SI2 clarity which is extremely vibrant and shiny. This 18k rose gold ring is proudly handcrafted in the USA. From the Allurez Island Jewelry collection. Available from Allurez. Priced at (subject to change) $3037.90

Black and White Diamond Wedding Ring Men’s Band Palladium (0.50ct)

Awesome range of black diamond men's rings - 40 brilliant-cut round black diamonds are accented by 8 brilliant-cut round white diamonds. These bright diamonds of G-H VS2 clarity are beautifully circling all the way around the ring and are set in an elegant channel-setting.Awesome range of black diamond men’s rings – 40 brilliant-cut round black diamonds are accented by 8 brilliant-cut round white diamonds. These bright diamonds of G-H VS2 clarity are beautifully circling all the way around the ring and are set in an elegant channel-setting. This comfort-fit unique band for men features a satin finish making the unique colored diamond ring unlike any other. With about 9 grams of palladium the ring is heavy in precious metal making it extremely valuable. Wear it as a wedding band as an anniversary ring as a men’s engagement ring or as a right hand fashion ring. Also available in other widths and precious metals. Available from Allurez. Priced at (subject to change) $1990.00

Men’s Black Diamond Nautical Compass Ring Palladium (0.25ct)

Awesome range of black diamond men's rings - This handsome nautical compass ring features a brilliant cut round black diamondAwesome range of black diamond men’s rings – This handsome nautical compass ring features a brilliant cut round black diamond of SI1-SI2 clarity which is extremely vibrant and shiny. This palladium ring is proudly handcrafted in the USA. From the Allurez Island Jewelry collection. Available from Allurez. Priced at (subject to change) $2780.50

1.62ct 14k Black Rhodium Gold Black Diamond Men’s Ring Size 11

Awesome range of black diamond men's rings - Light up the room with this classic black diamond ring Awesome range of black diamond men’s rings – Light up the room with this classic black diamond ring which has an approximate weight of 1.62 ctw. It makes for a great anniversary birthday or weddings day gift. Available from Allurez. Priced at (subject to change) $2170.00

Men’s Black Diamond Nautical Compass Ring Platinum (0.25ct)

Awesome range of black diamond men's rings - This handsome nautical compass ring features a brilliant cut round black diamond Awesome range of black diamond men’s rings – This handsome nautical compass ring features a brilliant cut round black diamond of SI1-SI2 clarity which is extremely vibrant and shiny. This platinum ring is proudly handcrafted in the USA. From the Allurez Island Jewelry collection. Available from Allurez. Priced at (subject to change) $4046.60

1.62ct 14k Black Rhodium Gold Black Diamond Men’s Ring

Awesome range of black diamond men's rings - Complete your look with this stunning black diamond ringAwesome range of black diamond men’s rings – Complete your look with this stunning black diamond ring which has an approximate weight of 1.62 ctw. It makes for a great anniversary birthday or weddings day gift. Available from Allurez. Priced at (subject to change) $2170.00

1.78ct 14k White Gold Black and White Diamond Men’s Ring Size 14

Awesome range of black diamond men's rings - Light up the room with this precious black diamond ringAwesome range of black diamond men’s rings – Light up the room with this precious black diamond ring which has an approximate weight of 1.78 ctw. It makes for a great anniversary birthday or weddings day gift. Available from Allurez. Priced at (subject to change) $2830.00

 

Feb
17
2016

An article was published by naturallycolored.com with the title “Are Black Diamonds Valuable.

This is an informative and factual account on the value of black diamonds when compared to white diamonds. A distinction is drawn between natural black diamonds and treated black diamonds.

 

14K Rose Cursive Love Black Diamond Necklace by Coby Madison

The article explains how diamonds with impurities reflect light as to have a color as opposed to the translucent shine and sparkle of the white diamond. Natural black diamonds are described as having so many inclusions uniformly spread across the stone as to appear completely black.

 

This Coby Madison black diamond ring will add a polished touch with a 1.12 carat pear shape gleaming black diamond is set in white gold 40 round white diamonds weighing 0.24 carats.The above describes the natural black diamond which is in stark contrast to the treated diamond which is “painted” by means of irradiation or heat treatment. These treated black diamonds are produced from what is described as being cheap and of inferior quality as per a commercial evaluation. The treatment produces a deep green which appears black and removes the sheen and sparkle associated with white diamonds.

 

This Coby Madison black diamond ring will add a polished touch with a 1.35 carat pear shape gleaming black diamond is set in white gold 40 round white diamonds weighing 0.25 carats.These treated diamonds have a lower retail value when compared to the natural black diamonds.  Treated black diamonds as per this source are not to be confused with lab grown or synthetic diamonds and as real as any other diamond.

 

 

A single rose cut pear shape black diamond weighing 1.67 carat sits surrounded by a halo of sparkling white diamonds totaling 0.35ctw. This unique 14k white gold black diamond ring is the perfect ring for the love of your life. This gorgeous ring available from Coby Madison Jewelry is a trend setting new look for a diamond engagement ring.Other sources will further draw a distinction between Carbonados, the rarer black diamond, which is a diamond of a different kind so to speak. These black diamonds are not the same as the natural black diamonds described above. Whereas diamonds may contain inclusions which produce a spectrum of different colors including black, the real black diamond has a different structure and is even harder than the normal diamond.

 

Black Diamond Necklace Stunning black diamond pear shape center totaling 1.22 ct. framed by 87 brilliant round white diamonds totaling 3/8 ctw. in this exquisite 14k white gold black diamond hanging drop necklace. This fabulous black diamond necklace is perfect accessory for any occasion.The distinctive black diamond is rarer in terms of a number of aspects. Carbonados are mined in parts of Africa and South America. They are on average smaller and have a poly crystalline structure, which makes them harder yet more brittle. These features makes it harder to cut, polish and process black diamonds in an economically viable manner for the purposes of jewelry.

 

Sterling Silver Diamond and Moonstone Evil Eye Necklace micro prong set with fifty-seven sparkling white diamonds 0.34cts. This unique evil eye diamond necklace is finished with black rhodium for a vintage appeal.The article further compares the current prices as per their research of treated black diamonds, natural diamonds and white diamonds. To illustrate a few examples from the site a per carat price measure of a natural black diamond stays more or less constant regardless of the size of the diamond at $3000 per carat.

 

250 White and Black diamonds weighting 2 1/2 cts, are pave and prong set in this stunning ring.This is in contrast to the price of the much cheaper treated black diamonds which according to their research escalated slightly as the size of the diamond increases. This is similar to the colorless white diamond, which dramatically increases in value as the size increases.

A single rose cut oval shaped black diamond weighting 3.69 ct, sits surrounded by a halo of 116 sparkling white diamonds totaling 0.52 ctw. in this unique 14k white gold black diamond ring. This fabulous look is the latest trend worn by many celebrities.In using this sample it was illustrated that a 3 carat white diamond would cost in the region of $36000 which would be more than the approximate $30000 price tag of a 10 carat natural black diamond Treated black diamonds as per this comparison would cost a mere $1500 for a 3 carat stone.

Stunning black rhodium finish heart pendant with snake biting apple. This fantastic heart necklace says she has a piece of your heart.

The article closes with the question “So… which would you prefer? Size or Color?”

Stunning 1 1/5 ct tw pendant set with one brilliant black diamond center stone, surrounded by micro prong set white diamonds in 14kt white gold. This exquisite black diamond necklace has romantic appeal with black rhodium finish.

The driving factor of price is obviously supply and demand. If the demand for black diamonds rise, will it be more economically viable to treat a large diamond which falls short in terms of the desired color or would it simply be cut into smaller pieces for background decoration in support of a higher quality gemstone.

 

A single rose cut pear shaped black diamond weighting , sits surrounded by a halo of sparkling white diamonds in this unique 14k white gold ring. This fabulous look is the latest trend worn by many celebrities.

A single rose radiant shaped black diamond weighting 1 1/4 ct, sits surrounded by a halo of 50 sparkling white & black diamonds totaling1/3 ctw. in this unique 14k white gold black diamond ring. This fabulous look is the latest trend worn by many celebrities.

Jul
29
2015

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We already know what Black Diamond are, what they are made of and have a fairly good Idea where they came from, but what is it that make them so endearing to so many people across the world? 

The popularity of Black Diamonds are rising significantly, this may be as a result of changing times, people looking for a change or jewellery matching their own outlook on life. There are many possible reasons why Black Diamonds are a rising trend among couples that are finding their feet in life and their careers.

 

Please take part in this simple social experiment and help us understand the complexities of the Black Diamond.

 

Jun
23
2014

18k White Gold Black Diamond Panda Bear RingAre black diamonds real diamonds?

What are black diamonds?

What’s all the fuss about black diamonds?

Do black diamonds come from out of space?

Who wears black diamond engagement rings?

What’s the difference between black diamonds and white diamonds?

 

 

Zebra Design 18k White Gold Black Diamond Bangle Bracelet from: Heavenly TreasuresZebra Design 18k White Gold Black Diamond Bangle Bracelet
from: Heavenly Treasures

Diamonds are carbon based crystals, which were formed under great pressure from organic or inorganic carbon. Typically diamonds were formed far underneath the earth’s crust and brought to the surface by means of volcanic activity. It is also believed that the impact of an asteroid can form diamonds as a result of the impact with the surface. The formation of diamonds is believed to be approximately 3 to 4 billion years ago.


Large Black Diamond Panda Bear Pin in 18k White Gold
Large Black Diamond Panda Bear Pin in 18k White Gold

A diamond reflects and refracts light in similar fashion to a prism, which accounts for the fire-like flash and sparkle characteristics. Diamonds are not all typically the same colour, however the most valuable diamonds are considered to be the white variety. Diamonds considered less valuable can be treated with heat or radiation to darken the colour or improve its uniformity. In this way any diamond can be made to appear dark or even black.


Inside and Out Black Diamond Hoop Earrings in 18k White Gold
Inside and Out Black Diamond Hoop Earrings in 18k White Gold

Diamonds are the hardest natural substances found on earth and as a result, has the effect that no other natural material can scratch them. This makes them so popular for their use in Jewellery. A true black diamond, however, is not the same as the traditional diamond described above. It is similar in that it was created from carbon put under immense pressure, but differs in some key aspects.

 

Who loves Black Diamond Jewelry in the USA?

Black Diamond Jewelry in the USA

A black diamond, also called a Carbonado (Portuguese for black), has a polycrystalline structure and is more porous as opposed to the solid piece white diamond. As a result the black diamond is more brittle yet is harder than the white. This also makes the black diamond harder to cut into shapes commonly used in white diamonds.

The impurities contained in the black diamond, absorbs light, causing the dark colouration and therefore lacks the lustre that makes its white counterpart attractive. Until recently, the black diamond was not commonly used in jewellery, because of its comparatively unimpressive appearance. In most instances, however, the diamonds used in jewelry is a normal diamond that is treated in order to darken its appearance. This is done because the diamond of a suitable size may not be of the desired clarity or consistency according to the value scale and as such is considered less valuable in its natural form when compared to the the top valued diamonds.

 

14k White Gold Black Diamond Snake Ring from: Heavenly Treasures
14k White Gold Black Diamond Snake Ring

from: Heavenly Treasures

 

Where are black diamonds found?

Where do black diamonds come from?

White diamonds are mostly found in igneous rock, which was brought to the surface of the earth by volcanic activity. In contrast the black diamond, is found in alluvial deposits only in Brazil and the Central African Republic, as opposed the relative wide distribution of the white diamond.

The limited distribution of the black diamond makes it in effect much rarer than the white diamond, yet the most alluring aspect of the black diamond may be the mystery surrounding its origins.


18k White Gold Black Diamond Frog Ring – $2,795.00
18k White Gold Black Diamond Frog Ring - $2,795.00 from: Heavenly Treasures
from: Heavenly Treasures

There are various theories hypothesized as to the beginnings of the black diamond. These include:

  • Formation within a star which exploded within a supernova and rained down onto earth billions of years ago by means of meteorites.
  • Shock metamorphism subsequent to meteorites impacting earth.
  • Creation upon impact on earth by an asteroid, as is the case with certain normal diamonds.
  • Radiation via fission of uranium and thorium.


18k White Gold Black Diamond Spinning Sphere Pendant and Necklace
18k White Gold Black Diamond Spinning Sphere Pendant and Necklace

The most popular theories favour the extra-terrestrial alternatives as a result of the differences in structure and composition of these two types of diamonds coupled with the fact that evidence suggest that the only two known locations where black diamonds are found were once joined, before they were separated via continental drift. This supports the theories of either localised meteor showers in this area or a massive asteroid impacting earth.

 

Black Diamond