Blue Violet Round Brilliant Tanzanite Gemstone 2.84 CaratsOne 2. 84 carats round brilliant cut tanzanite, blue violet vivid color, 10X LOUPE CLEAN clarity, cut grade very good, measuring 8. 8 mm wide, 8. 8 mm long, 5. 7 mm deep; with very good polish and good symmetry. The proportions of the tanzanite are as follows: total depth 69%, table width 55%. The overall quality rating of this tanzanite is 896 out of 1000. Tanzanites are enhanced by heating.