Buy it here →One 5.85 carats oval tanzanite, violet blue exceptional (40%/60%) more blue color, VS1 clarity, cut grade very good, measuring 8.8 mm wide, 12 mm long, 7.4 mm deep; with very good polish and very good symmetry. The overall quality rating of this tanzanite is 945 out of 1000. Tanzanite is color enhanced by heating.