Set of four dress studs, black onyx and diamonds on platinum and 18k yellow gold, round form encircled by single cut diamonds with single .05 brilliant round diamond at center. Marked "18" enclosed by a "C" on back. Original Tiffany & Co. fitted velvet-lined case. Each 1/2" diameter, 2.8 grams or .085 oz troy (.34 oz troy or 11.2 grams combined weight). Condition: Some light scratching to onyx centers.
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