Gems & Pearls
Strength in stones is determined by degree of hardness, and skill of the cut. The most rigid stones are diamonds fallowed by sapphires, rubies, emeralds, topaz, aquamarine, amethyst, garnet, and opal respectively. Turquoise is relatively soft, porous, and easily breakable. When exposed to dry conditions, natural pearls can loose their luster and crack. Cultured pearls introduced at the end of the 19th century are more durable, and a quality example is barely distinguishable from natural pearls.
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