Common ways to differentiate moissanite and lab grown diamond
People always have strange behavior, when they buy a lab grown diamond, or a friend bought a moissanite, they always like to figure out whether the lab grown diamond they or others bought is moissanite? And they will also use these methods to show their friends and family to show that they are professional enough. Here is a list of some easy ways to identify moissanite and lab grown diamonds.
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As HPHT method involves using metal catalyst, it is hard to avoid some metals entering the crystal during growing process, so HPHT diamonds might be magnetic. And if the magnetism is too strong, diamonds will not be able to pass the diamond teste. Because CVD diamonds are formed by mere gas, they can be produced without magnetic and are able to pass the diamond tester pen.
Fire method: burn the gemstone with a lighter, moissanite will appear slightly yellow, but after annealing, it will return to its original state, while the color of lab grown diamond will not change after the fire.
But be careful, do not exceed 600 degrees, or the real lab grown diamond will oxidize. Unless as a last resort, generally do not try this method to avoid disputes.
Specific gravity liquid: The specific gravity of lab grown diamond and moissanite are not the same, so you can distinguish them by using specific gravity liquid, but only for unset stones. (The chemical composition of the specific gravity liquid is diiodomethane, which is highly toxic, so you should be especially careful in using it.)