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Colourless diamond services
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Cleaning and sorting of chemically-unset melee diamonds
Cleaning & oiling of emeralds
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Watch industry gemstones
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Limitations for GGTL reports
Navigation SM
About us
Services
Main services
Colourless diamond services
Fancy diamond services
Gem services
Identification of biogenic materials
Jewellery
Exclusive services
Cleaning and sorting of chemically-unset melee diamonds
Cleaning & oiling of emeralds
Cullinan report
Watch industry gemstones
Consulting
Publications
T. Hainschwang
F. Notari
C. Caplan
F. Blumentritt
Other
Diplomas
Products
News
Contact
en
fr
