Platinum, Gold, Black Opal, Diamond and Onyx Pendant-Brooch, Cartier, Paris, Circa 1920 Set with a square-shaped black opal measuring approximately 18.7 by 18.7 mm., supporting a pear-shaped cabochon black opal measuring approximately 24.3 by 17.1 by 9.4 mm., accented by old European-cut and single-cut diamonds weighing approximately 3.25 carats, and carved onyx segments, signed Cartier, numbered 5649B, French assay mark.
Platinum, Gold, Black Opal, Diamond and Onyx Pendant-Brooch, Cartier, Paris, Circa 1920 Set with a square-shaped black opal measuring approximately 18.7 by 18.7 mm., supporting a pear-shaped cabochon black opal measuring approximately 24.3 by 17.1 by 9.4 mm., accented by old European-cut and single-cut diamonds weighing approximately 3.25 carats, and carved onyx segments, signed Cartier, numbered 5649B, French assay mark.
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