Tanzanite Ring 10kt Yellow Gold. This is a pretty ladies ring with tanzanite in 10kt yellow gold. The 3-row band ring is set with twenty-two round cut tanzanites, light blue in color. They weigh approximately 1.50cttw. The ring size is 7 1/2; it is hallmarked: ADL;10kt and includes an insurance appraisal of $450.00.