How can you tell if a moissanite is real?

Moissanite is a gemstone that is often used as a diamond alternative due to its similar appearance and durability. If you are trying to determine if a moissanite is real, there are a few things you can look for in moissanite rings:

1. Certification: A reputable moissanite supplier will provide a certificate of authenticity, which can verify that the gemstone is genuine moissanite.
2. Brilliance and Fire: Moissanites have a high refractive index, which means they can exhibit more brilliance and fire than diamonds. If the gemstone appears to have a high level of sparkle and rainbow flashes, it could be a sign that it is a genuine moissanite.
3. Double Refraction: Moissanite has a higher degree of double refraction than diamond, which can cause a doubling effect on the gemstone’s facets when viewed through a loupe. If you see double lines or a doubling effect when looking at the stone through a loupe, it could be a sign that it is moissanite.
4. Thermal Conductivity: Moissanite has a higher thermal conductivity than diamond, which means it will feel cooler to the touch when held in your hand. If you hold the gemstone for a few seconds and it feels cooler than other materials in the same environment, it could be moissanite.

If you are still unsure whether the gemstone is a real moissanite, you can take it to a reputable jeweller or gemologist for further analysis.

Another way to tell if a moissanite is real is to perform a simple scratch test. Moissanite is a very hard gemstone, with a hardness of 9.25 on the Mohs scale, which means it is harder than most gemstones including sapphires and rubies. You can use a testing tool such as a sapphire-tipped tester or a diamond tester to scratch the surface of the stone. If the tester does not leave a scratch, then the gemstone is likely moissanite.

However, it is important to note that performing a scratch test on a gemstone can potentially damage the stone, so it is best to have this done by a professional if you are not experienced in gemstone testing. Additionally, some moissanite manufacturers create moissanite with a coating to improve its colour or to prevent oil from adhering to the surface. In this case, a scratch test may not be accurate as the coating can affect the result.

Overall, the most reliable way to determine if a moissanite is real is to obtain a certificate of authenticity from a reputable supplier or to have it evaluated by a professional gemologist.