One-of-a-kind 18K white gold ring with tanzanite and diamond accents. Tanzanite, 20.05 tcw Diamonds, 0.99 tcw Diamond color: HI Diamond clarity: SI2-I1 18K white gold Made in USA SIZE Width, about 0.77" Click here for a Guide to Jewelry & Watches. Center Core - W Fine Jewelry > Saks Off 5th > Barneys Warehouse. Effy Hematian. Size: 7.