R1: Characterization and description of minerals (Joint Session with The Gemmological Society of Japan)

[R1-05] Morphology and Characterization of large gem quality HPHT-grown synthetic diamond crystals

*Hiroshi Kitawaki¹, Kentaro Emori¹, Mio Hisanaga¹, Masahiro Yamamoto¹, Makoto Okano¹ (1. Central Gem Laboratory)

Keywords:synthetic diamond, HPHT-grown, identification

In this report, we will introduce about gemological observations on large HPHT-grown synthetic diamond crystals recently made in China. Through careful observations, these products can be confidently identified as synthetics, even if they are cut and polished.