SSEF Swiss Gemmological Institute The SSEF Swiss Gemmological Institute is an independent, international, non-profit organisation dedicated to the identification of gemstones, gemstone treatments, origin determination, gemmological research and education.
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Diamond Grading Laboratory- AGS Laboratories Home Page There are certain things you can count on. A quality grading report from AGS Laboratories is one of them. It's always reassuring to have the opinion of an expert unbiased third party who can verify the quality of the diamond you are purchasing. AGS Labora
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Russian Gemological Server Business, research and educational projects in the gemology and jewellery filelds. Software & Hardware for diamond modelling, raytracing and cut optimisation. News and articles for diamond traders and researches.
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Gubelin Gemmological Laboratories the world's most renowned gem laboratory Gubelin Gemmological Laboratory keeping our gemstone report with traditions high standards, independent opinion of the laboratory, constant inovation and up to date technologies make the Gubelin Gemmological Laboratory the world most reknowned gem laborat
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GemResearch Swisslab (GRS) Specializing in Origin Determination of Fine Rubies and Sapphires GemResearch Swisslab (GRS) has invented its own high technology portable gemmological laboratory, computerised and with state-of-the-art spectrometers. GRS Heat Treatment thermal treatment gemmological heat enhancement process clarity color ruby sapphire
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