Blue Violet Trilliant Tanzanite 3.50 CaratsOne 3. 50 carats trilliant cut tanzanite, blue violet exceptional color, 10X LOUPE CLEAN clarity, cut grade very good, measuring 10 mm wide, 10 mm long, 6. 6 mm deep; with very good polish and very good symmetry. The proportions of the tanzanite are as follows: total depth 66%. Tanzanites are enhance by heating. The overall quality rating of this tanzanite is 929 out of 1000.