Frequently Asked Questions

I found a clear, colorless stone that I think may be a diamond because it scratches glass. How can I find out for sure?


Many minerals are colorless in their purest state. Anything with a hardness the same as or greater than glass (5 to 6 on the Mohs hardness scale), can scratch glass. Therefore, other gemological tests must be performed to confirm identification.
 
You can submit your stone to GIA for identification or have a local gemologist help you identify the stone.
 
Learn more about GIA Identification services.

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