Blue Violet Opposed Bar Tanzanite Gemstone 4.04 CaratsOne 4. 04 carats opposed bar tanzanite, blu violet vivid color, SI1 clarity, cut grade excellent, measuring 8. 6 mm wide, 9. 8 mm long, 6 mm deep; with excellent polish and excellent symmetry. The proportions of the tanzanite are as follows: total depth 69. 8%. The overall quality rating of this tanzanite is 883 out of 1000. Tanzanite is color enhanced by heating.