Lady's 18K White Gold Tanzanite & Diamond Ring. Ring Size: 7 1/4 (Can be Resized to Fit Most Any Finger.) Contains: One Natural Oval Cut Tanzanite. Weight Approx: 5.00ct, Color: Blue, Origin: Tanzania. 129 Natural Round Brilliant cut Diamonds. Weight Approx: 1.20cttw, Color: G-H, Clarity: VS-SI. This oval tanzanite is a gem, gem, gem in the highest sense of the word. If you are unfamiliar with tanzanite, it is found in Tanzania. It is so precious that there is a cartel just like DeBeers, fixing the price on tanzanite. It has gone from a semi-precious stone to a most precious gem. The picture says the rest. It is mounted in a handmade 18K white gold diamond set mounting. The diamonds are perfectly matched and go a long way in making this ring a dazzler. A reasonable gemological evaluation has this ring at $20,700, and as usual, Capetown offers it at an unbelievable low price. A trip to your local jeweler will show you, you cannot buy anything this elegant for under $10,000. As with emeralds, Tanzanite is a soft stone so put it on your homeowner's policy.