Tour necklace in 850 thousandth platinum and 18k white gold, the central motif decorated with scrolls, extended by rectangular rings, the whole set with one hundred and eighty-six modern brilliant-cut diamonds, secure ratchet clasp. French work, 1950s. Marked by master goldsmith Robert Blanc, a Parisian jeweller active since 1950. Estimated total weight of diamonds: 7 ct Length : 38 cm - Width : 1.8 cm Gross weight: 41.3 g Note: this necklace formerly belonged to a convertible set with two brooches featuring birds in the central motif, which is why there are two clasps visible on the back.