1.31ct Round Brilliant Cut Tanzanite Gemstone On hold for Betty JohnsonOne 1. 31 carats round brilliant cut tanzanite, violet blue vivid (more blue) color, VS2 clarity, cut grade very good, measuring 6. 5 mm wide, 6. 5 mm long, 4. 5 mm deep; with good polish and good symmetry. The proportions of the tanzanite are as follows: total depth 69. 2%, table width 53. 8%. Tanzanite is color enhanced by heating.