Violet Blue Oval Tanzanite GEmstone 3.51 CaratsOne 3. 51 carats oval tanzanite, violet blue exceptional (30% 70%) more blue color, VS1 clarity, cut grade very good, measuring 8. 6 mm wide, 10. 2 mm long, 6. 2 mm deep; with very good polish and very good symmetry. The proportions of the tanzanite are as follows: total depth 72. 9%, table width 47. 6%. The overall quality grade of this tanzanite is 962 out of 1000. Tanzanite is color enhanced by heating.