One 18.09 carats oval tanzanite, violet blue exceptional plus color, 10X LOUPE CLEAN clarity, cut grade excellent, measuring 15 mm wide, 18 mm long, 9.6 mm deep. The proportions of the tanzanite are as follows: total depth 64%, table width 56.6%. The overall quality rating of this tanzanite is 968 out of 1000. Tanzanites are enhanced by heating.