Violet Blue Antique Cushion Tanzanite Gemstone 17.30 CaratsOne 17. 30 carats antique cushion tanzanite, violet blue exceptional color, FLAWLESS TO VVS clarity, cut grade excellent, measuring 14. 3 mm wide, 15. 2 mm long, 10. 8 mm deep; with excellent polish and excellent symmetry. The proportions of the tanzanite are as follows: total depth 75. 5%, table width 59%. The overall quality rating of this tanzanite is 975 out of 1000. Tanzanite is color enhanced by heating.