Ring, Earrings, Bracelet, Pendant with Moissanite/ lab grown diamond/Eemerald your personal jewelry maker.
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.
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.