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925 is the silver quality and I beleive that the TGGC is a company trademark. The Genuine Gemstone Company. TGGC dot com
It means that it was commissioned and sold by TGGC or The Genuine Gemstone Company.
What does 925 tggc on a gold ring mean
Tanzanite
the complimentary styrand would be: T-C-C-G-A-T