PLATINUM & 18K TANZANITE & DIAMOND RING: 1.70 CT triangular cut tanzanite is featured in this unique setting and is free of inclusions. 46 round brilliant cut diamonds approx .31 CTW. Weighs approx 6.80 grams. Sold with appraisal by Jewelry Appraisers of America, Inc for $4450 and is dated 12-28-11.