A rubellite and diamond halo ring, consists of an emerald-cut rubellite of 15.4 x 12.9 mm, claw

A rubellite and diamond halo ring, consists of an emerald-cut rubellite of 15.4 x 12.9 mm, claw set to a surround with brilliant-cut and baguette-cut diamonds, with trident shoulders to a tapering adjoined shank, Italian hallmarked '750' with maker's mark 'B.S.G', size N, total weight of item 13.0 grams.