One 1.51 carats trilliant cut tanzanite, blue violet vivid color, 10X LOUPE CLEAN clarity, cut grade very good, measuring 7.5 mm wide, 7.5 mm long, 4.5 mm deep. The proportions of the tanzanite are as follows: total depth 60%.the overall quality rating of this stone is 833 out of 1000. Tanzanites are color enhanced by heating.