Buy it here →One 4.07 carats trilliant cut tanzanite, blue violet exceptional (40% blue/60% violet0 color, VS1 clarity, cut grade very good, measuring 9.5 mm wide, 9.5 mm long, 7.1 mm deep; with good polish and very good symmetry. The overall quality rating of this tanzanite is 930 out of 1000. Tanzanite is color enhanced by heating.