GSI certificate - Gemological Science International - GSI vs GIA

Gemological Science Intl.
GSI provides gemstone identification, grading & testing services, research & educational programs to the diamonds, gemstone & jewelry trade.
www.gemscience.net

For more information please visit: https://www.instagram.com/gemscienceinternational/


Useful links:

GSI
Gemological Science International
GSI vs. GIA
GSI certified
GSI certificate



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