Blue Violet Round Tanzanite Gemstone 1.64 CaratsOne 1. 64 carats round brilliant cut tanzanite, blue violet exceptional color, FLAWLESS TO VVS clarity, cut grade excellent, measuring 7 mm wide, 7 mm long, 5. 3 mm deep; with very good polish and excellent symmetry. The proportions of the tanzanite are as follows: total depth 75. 7%. Tanzanite is culor enhanced by heating. The overall quality rating of this tanzanite is 948 out of 1000. Customize a Ring or Pendant with This Gemstone? Did you know