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A Carved Onyx and Diamond "Key to my Heart" Pendant Necklace, by Cartier, circa 1970

A Carved Onyx and Diamond "Key to my Heart" Pendant Necklace, by Cartier, circa 1970

The chain of openwork lock motifs suspending a large pendant designed as a key, decorated with vari-cut onyx and pairs of brilliant-cut diamonds.

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