1970s Aquamarine Diamond Ring

A platinum, aquamarine and diamond ring. Circa 1970. Set with an emerald cut aquamarine, measuring approximately 23.0 x 11.5 x 8.mm, and weighing approximately 16.50 carats, with circular cut diamond line shoulders, and fluted openwork shank. Twelve (12) diamonds weigh approximately 1.5 carats. Size 7 1/2, gross weight is approximately 21.6 grams.