Violet Blue Antique Cushion Tanzanite Gemstone 15.12 CaratsOne 15. 12 carats antique cushion tanzanite, violet blue exceptional (mostly blue) color, FLAWLESS TO VVS clarity, cut grade excellent, measuring 12. 7 mm wide, 14. 9 mm long, 10. 3 mm deep; with very good polish and excellent symmetry. The proportions of the tanzanite are as follows: total depth 81%, table width 60. 6%. The overall quality rating of this tanzanite is 958 out of 1000. Tanzanite is heated to enhance color. An exceptional blue gem.