Arete synthetic-diamond tester by Gemtrue, 'Duo' model, includes a Diamond Experior tester Digital scales - regular lines - resolution 0.01g Alternatives

Alternatives

Test the stone on the Diamond Experior thermal tester (included)

freeze-frame etc (which make you go completely dizzy) - just one easy-to-feel button to change the magnification

to help you decide which one it is

For the non-expert: make sure the stone is recent (eg not from the 19th century) and is round

Arete synthetic-diamond tester by Gemtrue, 'Duo' model, includes a Diamond Experior tester Digital scales - regular lines - resolution 0.01g AlternativesSummary Arete synthetic diamond tester plus a free Diamond Experior thermal diamond tester. Between them, they test for natural diamond, synthetic (= lab grown) diamond, Moissanite, and "any other stone". The GemTrue Arete is an essential tool for the experienced jeweller and professional diamond dealer, it is for testing known diamonds, to see if they are natural or synthetic. That means you must first test the stone on a good quality diamond tester