Our big size single crystal synthetic diamonds are produced by high pressure, high temperature (HPHT) synthesis refer to those synthetic diamond crystals which size>0.8mm, due to technical requirements and cost of production are more and more higher than synthetic diamond power, this type has be separated out for easier sorting,
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However, dramatic improvements in HPHT growth technology and techniques in the past two or three years have had a profound effect on how jewelers must examine their stocks of melee-sized diamonds. HPHT synthetic diamond melee growth is quickly becoming a large industry in China (figure B-1, left).
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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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The HPHT process, through the laboratory, takes the diamond back to its formative environment and causes the platelets of nitrogen to be dispersed within the crystal lattice. This dispersion of nitrogen platelets into much smaller nitrogen molecules causes the off-color diamonds to take on a color of fancy yellow to yellow-green.
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Figure 1. A: These three colorless HPHT-grown synthetic diamonds demonstrate some of the sizes achieved by New Diamond Technology. From left to right, samples NDT04, NDT02, and NDT01 weigh 2.02, 2.20, and 2.30 ct, respectively.
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