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14K White 4.0-4.5 mm Freshwater Cultured Pearl Pendant J 14K Yellow Cultured Freshwater Pearl14K White 4. 0 4. 5 mm Freshwater Cultured Pearl Pendant Pure gold (fine gold) is softer than pure silver but harder than tin. Its beauty and luster are unmatched by any alloyed gold. The extreme malleability, ductility, and softness of pure gold make it practically useless for jewelry applications. Alloying elements (other metals) are added to gold to increase the toughness and hardness of the gold alloy. While almost any metal can be alloyed