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Research Reports
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Sapphire in various colours filled with lead-glass by GAAJ-ZENHOKYO Laboratory: Makoto Okano FGA, CGJ , Hiroshi Kitawak FGA, CGJiMay 30, 2010
Lead-glass filled sapphires in various colours were recently brought to our laboratory for identification.
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Iridescent Nuumite by GAAJ-ZENHOKYO Laboratory: Taisuke KobayashiMarch 07, 2010GAAJ-ZENHOKYO laboratory recently had an opportunity to identify black cabochon stones called “nuumite” from Mauritania. —read more |
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The forefront of diamond synthesis Vol.4 by Dr. Yoshinori KOGA National Institute of Advanced Industrial Science and Technology (AIST)February 17, 2010APPLICATION OF DIAMOND-LIKE CARBON —read more |
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Trapiche spinel by GAAJ-ZENHOKYO Laboratory Makoto Okano (FGA, CGJ), Dr. Ahmadjan Abduriyim (FGA)February 08, 2010We recently obtained spinel samples with trapiche appearance for research, —read more |
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Natural Cavansite and Natural Pentagonite by GAAJ-ZENHOKYO Laboratory;Taisuke Kobayashi (FGA, GIA GG, CGJ), Dr. Ahmadjan Abduriyim (FGA)January 05, 2010
Cavansite and pentagonite - How to distinguish beteen them —read more |
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The forefront of diamond synthesis Vol. 3 by GAAJ-ZENHOKYO LABORATORY; Hiroshi Kitawaki (FGA, CGJ)January 02, 2010Development of gem quality synthetic diamond and identification techniques. —read more |
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New Geological Origin: Ruby from Mozambique by GAAJ-ZENHOKYO Laboratory: Jun Kawano (Ph.D), Hiroshi Kitawaki (FGA, CGJ), Ahmadjan Abduriyim (Ph.D), Makoto Okano (FGA, CGJ)December 02, 2009GAAJ-ZENHOKYO tested rubies allegedly from Mozambique —read more |
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The study of various beads used for cultured pearls by GAAJ-ZENHOKYO Laboratory: Ahmadjan Abduriyim, Hiroshi Kitawak, Counsellor of Japan pearl promotion society: Shigeru AkamatsuiNovember 01, 2009GAAJ-ZENHOKYO investigated the bead materials that currently exist. —read more |
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Natural Omphacite by GAAJ-ZENHOKYO Laboratory: Makoto Okano (FGA, CGJ), Hiroshi Kitawaki (FGA, CGJ), Ahmadjan Abduriyim (Ph.D., FGA), Jun Kawano (Ph.D.)October 26, 2009
Deep green to black “jade” has been gaining popularity, This material is often called “black jade” but mineralogically this is not jadeite but omphacite. —read more |
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Identification of black opaque gemstones by GAAJ-ZENHOKYO Laboratory: Makoto Okano, Hiroshi KitawakiOctober 25, 2009Demand for black opaque gemstones has been on the increase in the past few years —read more |