Blue Violet Antique Cushion Tanzanite Gemstone 18.01 Carats CFOne 18. 01 carats antique cushion tanzanite, blue violet exceptional (40% 60%) color, VS clarity, cut grade excellent, measuring 14 mm wide, 16 mm long, 11 mm deep; with excellent polish and excellent symmetry. The proportions of the tanzanite are as follows: total depth 78. 6%, table width 40. 7%. The overall quality grade of this tanzanite is 967 out of 1000. Tanzanite is color enhanced by heating. Customize a Ring or Pendant with This Gemstone? Did