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14K Yellow Gold Lab-Grown Blue Sapphire & .05 CTW Natural Diamond Halo-Style 18" Necklace .025 Ctw Natural Diamond Lotus Necklace } 10k Gold University of14K Yellow Gold Lab Grown Blue Sapphire & . 05 CTW Natural Diamond Halo Style 18" Necklace 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