Is this glass or corundom

by Brian leamy
(San francisco)

Is this glass or corundum (sapphire/ruby) Streak test clear sg 4.01 mohs 9 color red uv light red bright yellow. Glass or saphhire.

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Oct 14, 2019
Ruby? NEW
by: WKG

I am a Graduate Gemologist and ex-appraiser, but I'm giving a non-binding opinion based on photos. Just looking at your pieces, they appear very consistent in color throughout the piece. If they are indeed corundum, (are they dichroic?) they look synthetic. As far as I can see on the internet, rubies from California are not gem grade, as the pieces in your photo would appear to be.


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