Platinum Tanzanite and Diamond Ring 1.56 CaratsOne platinum ring set with a 1. 56 carats round brilliant cut tanzanite, violet blue vivid (40% 60%) color, VS1 clarity, cut grade very good, measuring 7 mm wide, 7 mm long, 4. 6 mm deep; with good polish and very good symmetry. Accenting the tanzanite are . 25 carats of round brilliant diamonds with G color and Si2 clarity. The ring weighs 5. 02 grams. The tanzanite is color enhanced by heating. We understand that this is a big purchase. If you have