Significant topaz cocktail ring 585 gel. ring size: approx. 55. ring head dimensions: approx. 30.0 x 27.0 mm. total weight: approx. 17.8 g. very large cocktail ring, set with a large central topaz of approx. 49.00 ct., and a halo of marquise and brilliant-cut diamonds totaling approx. 2.40 ct. g-i/vvs-si.