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Plastic ,Glass or Stone ?
Hello,
My gem knowledge is incredibly basic. I'd love to have gone on a Gemology course but I joined in this wonderful trade far far too late to consider doing a gemstone course as well as learning the entire making proccess from the begining.
I however, have got access to a digital refractometer, this helps massively but I got totally stumped the other day, as the batteries ran out and I had no replacements, a customer turned up looking to sell a ring and I had no way of knowing what the "Stone" was.
One was a Black cabooshon oval stone and the other a flat Black signet ring set stone.
My guess was they were Onyx, so based on this I made the guy an offer, explaining honestly my inexperiance and he was happy with the price I offered.
He did tell me, he couldn't be sure if the stone was Plastic,Glass or Onyx....So without a refractometer, is there a way to tell these apart easily ?
Thank you
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Yes, but he might not have liked it. Plastic will burn, and glass will melt. The essence of a good deal is that both parties are happy.
On a more serious note, there is a myriad of black stones as seen in the link below, but the metal of the ring would give a clue as to the order of value. In fact it might be the only valuable thing about it. So a hallmark would be the first thing to look for.
https://www.google.co.uk/search?q=ho...vqAenGXoqYsLgL Dennis.
Last edited by Dennis; 24-11-2017 at 10:06 PM.
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Thank you....But without damaging the sellers property, is there any way to tell if the "Stone" was either Plastic,Stone or Glass ? The rings were 958 Silver hallmarked.
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