Long overdue, really.
Useful link:
http://www.gubelin.com/en/gemmology/news/switzerlands-ssef-and-guebelin-gem-lab-agree-to-harmonise-pigeon-blood-red-and-royal-blue-standards
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Thursday, December 17, 2015
SSEF And Gübelin Gem Lab Agree To Harmonise Pigeon Blood Red And Royal Blue Standards
Labels:
colored stones,
gem labs,
Gubelin,
SSEF
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