Web Reference: Feb 12, 2026 · Key takeaways • Yes, lab diamonds pass professional thermal diamond testers. • They are chemically identical (carbon) to natural diamonds, so they conduct heat the same way. • Warning: Cheap '$15 Amazon Testers' may give false negatives on high-purity (Type IIa) lab diamonds. While all genuine diamonds – both natural and lab-grown – will pass standard diamond testers, the results can vary slightly depending on the type of tester used and the specific characteristics of the diamond. Lab-grown diamonds are identical to natural diamonds and therefore do pass a diamond tester. Since these gemstones are chemically, physically, and optically the same as their natural counterparts, a thermal conductivity test will confirm them as genuine diamonds.
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