Blue Topaz & Diamond Ring 14kt Yellow Gold. This a beautiful ladies cocktail ring set with one oval cut and two heart cut blue topaz weighing approximately 4.03cttw and twelve round brilliant cut diamonds totaling 0.12cttw. The blue topaz are referred to as Swiss Blue in color. The ring, size 8 3/4, was cast and handset and is in very good condition. Â Included is an insurance appraisal for $975.00.