Ladies' 18k yellow gold tanzanite ring by Christopher Michael, with one blue violet exceptional color, GIA Type I Clarity VS+, oval tanzanite. The tanzanite weighs 2.49 carats, measures 7 mm wide by 9 mm long by 5.5 mm deep, and is 6 prong set. The ring weighs 3.5 grams. Tanzanite is enhanced by heating.