Diamond/Gem Testers

Shop professional diamond and gem testers trusted by jewelers, gemologists, and appraisers worldwide. Our range covers thermal and electrical conductivity testers that separate diamonds from moissanite and simulants, plus synthetic diamond screeners that sort natural diamonds from CVD and HPHT lab-grown stones. Whether you work at the counter, in the lab, or at a trade show, you will find fast, accurate instruments from leading brands including Presidium, Gemlogis, GemTrue, and GEMORO.

Not sure whether you need a tester or a screener? A tester confirms whether a stone is a diamond, moissanite, or simulant, while a screener returns a pass or refer result to flag possible lab-grown diamonds. Compare handheld pen testers, dual-conductivity models, and desktop screeners below, all shipped worldwide from Bangkok, Thailand.