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Gemstones, Minerals & Fossils
Gemstones and Minerals
help with sapphires
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<blockquote data-quote="Lefty" data-source="post: 297337" data-attributes="member: 2976"><p>What is "gem reader" device? I think that tests like relative density (specific gravity) and taking a refractive index with a good refractometer might be more reliable indicators but could you give me the name of this particular unit? I'd like to know what it's testing for (thermal conductivity perhaps?)</p><p></p><p>It's hard to tell from the photo, some backlighting might give a better idea. Most don't look much like sapphires to me unfortunately. But the small one in the centre of the pile towards the top looks interesting - the colourless but brightly transparent looking one. Could possibly be topaz or colourless zircon.</p><p></p><p>Anyway, I'm interested to see some backlit pics, hopefully you might just have something worthwhile among them. Cross fingers.</p><p></p><p>Cheers</p></blockquote><p></p>
[QUOTE="Lefty, post: 297337, member: 2976"] What is "gem reader" device? I think that tests like relative density (specific gravity) and taking a refractive index with a good refractometer might be more reliable indicators but could you give me the name of this particular unit? I'd like to know what it's testing for (thermal conductivity perhaps?) It's hard to tell from the photo, some backlighting might give a better idea. Most don't look much like sapphires to me unfortunately. But the small one in the centre of the pile towards the top looks interesting - the colourless but brightly transparent looking one. Could possibly be topaz or colourless zircon. Anyway, I'm interested to see some backlit pics, hopefully you might just have something worthwhile among them. Cross fingers. Cheers [/QUOTE]
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Gemstones, Minerals & Fossils
Gemstones and Minerals
help with sapphires
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