GIA 20.45CT Natural Tanzanite Excellent cut Clean Clarity Best color D-Block Classic GIA "Violetish Blue" Measures: 18.23 X 12.90 X 10.24 mm Diamonds: 2.50ct. G-color, Vs-2 clarity 22.1 grams 18kt. white gold Head of ring: 24.74 X 19.80 mm depth: 10.40mm current ring size: 7 & can be resized, please inquire first. $52000 appraisal will accompany.