There is a device that can identify diamonds with a single touch. It is about the size of a ball-point pen and contains a battery which can heat the tip to red heat.A diamond, being pure carbon, is a heat sink and when the hot tip of the instrument is applied, the heat is immediately drained away and the machine goes "Beep."think it’s off a necklace, it has a stamp on back but can’t tell what it says. Top stone looks like a diamond but I’m not an expert by any means, but bottom stone not sure. Any thoughts guys?
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