Tanzanite Ring 10kt Yellow Gold. This is a gorgeous ladies ring with tanzanite in 10kt yellow gold. The bypass style cluster ring is set with nine oval cut tanzanites, medium-light, grayish to slightly grayish, Violet in color. They weigh approximately 1.71cttw. The ring was cast and handset with a bright polish finish, it is in very good condition. The ring size is 6 1/4; it is hallmarked: STS: THAILAND: 10kt and includes an insurance appraisal of $825.00.