GIA released a 34.59ct emerald cut synthetic diamond testing report this week, which is the largest polished synthetic diamond tested by the agency to date, from Indian synthetic diamond producer Ethereal Green Diamond.
According to the appraisal report issued by GIA, this 34.59ct synthetic diamond has a G-color, VS2 clarity level, and is a Type IIa diamond with a size of 24.94×13.95×9.39mm. Researchers have found common black inclusions in synthetic diamonds inside the crystal. Microscopic observation shows that faint oil like or wavy patterns can be seen through the countertop, which is also a common feature of chemical vapor deposition (CVD) synthetic diamonds.
The largest CVD synthetic diamond previously tested by GIA weighs 16.41ct and is cut in a princess square shape with G color and VVS2 clarity, produced by Shanghai Zhengshi Technology Co., Ltd.
At present, there are two main methods for cultivating synthetic diamonds in the laboratory – the “High Temperature and High Pressure Method” (HPHT), which requires the carbon atoms in graphite to be reassembled into diamond structures under a pressure of over 10GPa and a high temperature environment of 2000 ℃ -3000 ℃; The Chemical Vapor Deposition (CVD) method is formed by the deposition of carbon elements generated by the combustion of methane. After the carbon atoms dissociate, they attach to the diamond sheet, allowing the diamond to grow.
Image: 34.59ct Emerald cut CVD synthetic diamond, in G color and VS2 clarity.
Figure: 16.41ct Princess Square Cut CVD Synthetic Diamond, G-color and VVS2 Clarity.
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Post time: May-15-2023