So I recently bought a watch to sell it again. It has diamonds, my Moissanite/Diamond tester did all the job. And then I came across with a small blue stone. My color gem tester says it's topaz but I know that testers are not always enough. I used my UV light and then this little gem showed up red! Can anyone please help me identifying this little blue gem?
Joined: Sun Oct 16, 2005 12:22 pm Posts: 21602 Location: San Francisco
There are free beginning courses to read on the left. This is not a consumer's board.
For us to help here, we would minimally need to know if the gem is singly or doubly refractive, polariscope reaction, refractive index, microscopic observations. UV can be helpful. I presume you have only LWUV.
Can you supply any more information?
I would be curious about SWUV reaction coupled with polariscope reaction.
Red fluorescence is normally associated with chromium or cobalt. Of those two, cobalt is the one associated with a blue body colour, so Osman is probably right.
SR in a polariscope (x-hatch AE effect?) + "thick-thick-thin syn-spin"* lines through a spectroscope would be diagnostic.
* Nearly all cobalt blue spinels are synthetic, but th very few natural Co-spinels would also obviously show this absorption pattern.
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