Blue Violet Oval Tanzanite Gemstone 3.68 CaratsOne 3. 68 carats oval tanzanite, blue violet exceptional color, VS clarity, cut grade very good, measuring 8 mm wide, 10 mm long, 6. 1 mm deep; with very good polish and very good symmetry. The proportions of the tanzanite are as follows: total depth 76. 3%, table width 57. 5%. The overall quality rating of this tanzanite is 910 out of 1000. Tanzanite is color enhanced by heating.