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 Why do Sapphires come in so many colors?

 Sapphire in it’s purist state will grow colorless. Different colors occur due to trace elements found in the ground while the crystal is growing.

What is the difference between a synthetic and a simulant?

A synthetic is chemically and optically the same as a natural stone though it is created in a laboratory. A simulant is any stone that appears similar in look or color to a natural gemstone.

Why do diamonds cost so much?