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Lab Alerts
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Coating Treatment on Black Spinel by GAAJ-ZENHOKYO Laboratory; Dr. Ahmadjan Abduriyim, Makoto OkanoFebruary 02, 2009
We recently had an opportunity to identify several pieces of natural black spinel with coating treatment —read more |
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Black Moissanite by GAAJ-ZENHOKYO Laboratory Hiroshi Kitawaki (FGA, CGJ)February 02, 2009
Recent trends indicate an increased amount of black diamond jewellery containing synthetic moissanite.
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Lead glass filled Black Star Sapphire by GAAJ-ZENHOKYO laboratoryOctober 29, 2008
We recently identified lead glass filled black star sapphire —read more |
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BLUE ARAGONITE by GAAJ Research Laboratory:Dr. Ahmadjan AbduriyimJanuary 28, 2008
Examination of a beaded necklace brought into GAAJ-ZENHOKYO Laboratory using spectrophotometer and EDXRF, revealed that the necklace consisted of a mixture of natural and dyed aragonite. The stones closely resemble blue aragonite from Peru... —read more |
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Treatment in Blue Sapphire "Super Diffusion Tanusorn" - filling treatment with cobalt-coloured lead glass by GAAJ-ZENHOKYO Research Laboratory: Dr. Ahmadjan AbduriyimDecember 26, 2007Fissures and cavities filled ruby with lead-based glass started appearing on the market at the beginning of 2004. —read more |