This technology has been around for a while and this product is very cheap now. It will accurately test diamonds and even rubies (although it cannot tell them apart from an irradiated or heat-treated stone). Diamonds have the highest thermal conductivity of any stone (natural or synthetic), and rubies rank just below diamonds. This device evaluates this precisely and quickly. We've tried various synthetic and real stones and found them to be accurate on everything from pavรฉ to larger carat (+) diamonds. Nice to have if you're looking for a good deal at a pawn shop or estate sale. We all know they often tell you
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