Frequently asked questions
I have found a clear, colourless stone that I think may be a diamond because it scratches glass. How can I find out for sure?
Many minerals are colourless 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 gemmological tests must be performed to confirm identification.
You can submit your stone to GIA for identification or have a local gemmologist help you to identify the stone.
Learn more about GIA Identification services.
