Blue Violet Decagon Tanzanite Gemstone 2.69 CaratsOne 2. 69 carats Decagon tanzanite, blue violet exceptional color, VS2 clarity, cut grade excellent, measuring 8 mm wide, 9. 7 mm long, 5. 2 mm deep; with very good polish and excellent symmetry. The proportions of the tanzanite are as follows: total depth 65%, table width 40%. Tanzanite is color enhanced by heating. The overall quality rating of this tanzanite is 915 out of 1000. An original cutting design excecuted by Steve Moriarty.