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 diamond identification and colored stone services.