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Rough uncut HPHT synthetic diamond Lab Grown Diamonds are grown in highly-controlled laboratory conditions that simulate the earth's natural growing environment, producing real diamonds that are optically, physically and chemically identical to earth mined diamonds, so its refractive index ,density ,hardness ,dispersion and crystalline ...
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The synthetic diamonds have reached the same level as natural diamonds. Even the jewelers can't distinguish themselves with the naked eye or with a magnifying glass. With CVD or HPHT method, people can synthesize yellow and white diamonds. Synthetic diamonds can be used for diamond rings, earrings and necklaces, and other general diamond jewelry.
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With CVD or HPHT method, people can synthesize yellow and white diamonds. HPHT Synthetic diamonds can be used for diamond rings, earrings and necklaces, and other general diamond jewelry. Or some special commemorative diamonds. Nowadays, the production technology of synthetic diamonds is becoming more and more perfect.
What is the Difference between CVD diamonds and HPHT diamonds?
What is the Difference between CVD diamonds and HPHT diamonds? ... which changes the color of the diamond from a brownish tint to white. Diamonds that are subjected to the HPHT treatment must have a clarity of VS1 or better. ... GIA will not grade a CVD lab synthetic diamond.
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HPHT is one of method to create lab grown diamond by hydralic press machine, engineers mix the diamond power and graphite together to dissolve in metal catalyst, this carbon dissolved from catalyst flow into high pressure cavity by high temperature and high pressure reaction, in this way, the carbon grows on the lower temperature diamond seeds into jewelry grade white, yellow mono crystal diamond.
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Synthetic diamond is also widely known as HPHT diamond or CVD diamond. Synthetic CZ or Lab Created Moissanite is totally different chemical and physical properties from natural diamonds, but synthetic diamond is same chemical and physical properties as earth mineral diamonds.
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CVD diamonds also typically grow as a brownish or grayish color and have to be HPHT-treated (different process than HPHT-growing, but can be done in the same machines) at additional cost to whiten them, healing defects in the crystal lattice. The cost to grow a rough white diamond is generally comparable with the cost to mine one from the ground.
Synthetic diamond - Wikipedia
Synthetic diamond is the hardest known material, where hardness is defined as resistance to indentation. The hardness of synthetic diamond depends on its purity, crystalline perfection and orientation: hardness is higher for flawless, pure crystals oriented to the direction (along the longest diagonal of the cubic diamond lattice).
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Identifying CVD Synthetic Diamond - JCK
Identifying CVD Synthetic Diamond January 1, 2004 by Gary Roskin The Gemological Institute of America (GIA) reports that four Apollo rough crystals and four Apollo faceted diamonds were submitted to GIA's Gem Trade Lab (GTL) for identification and research.
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Since these products are only available in faceted form, the as-grown "rough" specimens are considerably larger. D.NEA (2014c) reports selling its "white" synthetic diamonds at prices "15-40% less than comparable mined diamonds." Currently, AOTC is the dominant producer of near-colorless HPHT synthetic diamonds for the gem trade.
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Sustainable Yield HPHT Synthetic White Rough Diamond Zhengzhou Sino Crystal Diamond Joint Stock CO.,Ltd.,was established in 2004.We concentrate on the development, production and sales of superhard materials and their products, raw and auxiliary materials and the development of synthetic diamond equipments.