Queen's sapphire and diamond necklace worth less after alteration

A beautiful tutti-frutti art-deco necklace with vibrant colored natural gemstones, 56.3 carats Colombian Emerald, 24.84 carat Ruby, 15.64 carat Sapphire and 1.65 carat Diamonds - all set in solid 18K Yellow Gold. The necklace is around 20 inches (not including the pendant part) long, and can be altered.

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