u/Muted_Shape9303

It’s science, not magic, many natural gemstones have an absorption spectra such that certain wavelengths are absorbed in a way that depending on the light source, the gem will appear blue or purple.

Did you know?
Shortly after dawn on May 12, 1918, the British troop transport Olympic (Titanic’s Sister), rammed and sank German submarine U-103 in the English channel, making it one of two victorious encounters with enemy units. Olympic would be torpedoed by U-53 off Southampton on September 4 that same year by a spread of two torpedoes. The first missed ahead, and the second struck Olympic but its detonator failed and the ship was minimally damaged.

So the first rule out is the easiest: synthetic Moissanite exhibits a very obvious birefringence, it is also significantly sparklier than a diamond, which makes it extremely easy to spot. This leaves CZ and Diamond. For CZ, chipping is the most diagnostic clue? It does look EXTREMELY similar to diamond. Finally, synthetic diamond would be the hardest to rule out since the only signs of a diamond being man-made are striations (that may as well be natural graining), certain inclusions, and chemical purity (synthetics are type IIa mostly)?

We are used to thinking of Sapphire as a blue gemstone, but actually, it’s found in any color except red—because a red Sapphire would be a ruby. Yes, Sapphire and Ruby are the same gemstone, just different colors. Sapphire is all colors EXCEPT red.