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ONYX AND DIAMOND RING Set with a princess-cut diamond within a geometric setting of onyx and princess-cut diamonds, French import hallmark for platinum (850 ‰), ring size 51.5, gross weight 16.93 g. ONYX AND DIAMOND RING Set in the center with a princess-cut diamond within a geometric setting of onyx and princess-cut diamonds on the shoulders, French import hallmark for platinum, ring size L, gross weight 16.93 grams. For further information on this lot, please visit Bonhams.com