![]() ![]() This makes it one of the toughest crystals, second only to diamond. Sapphires are rated 9 on the Mohs hardness scale. The highest quality occurs in a lemon-yellow shade. Yellow sapphires are also known as golden sapphire if they have an intense yellow color. ![]() The low iron content in a conundrum is responsible for its yellow coloring. ![]() They can also be massive or granular habits. This is an aluminum oxide mineral forming in bipyramidal, prismatic tabular, and rhombohedral crystals. ![]()
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