Natural pearl and diamond ring, circa 1920, set to the top with seven collet-set rose-cut diamonds, with a white natural round pearl measuring approximately 7 mm on one side and a grey natural round pearl measuring approximately 8 mm on the other, mounted in platinum, size 52 (L), French assay mark. Accompanied by a Laboratoire Francais de Gemmologie report numbered 193593, dated 27 October 2010, stating that the two half drilled white and grey pearls are natural, with the grey pearl showing no indication of colour alteration due to silver salts.