Blue Violet Stepped Octagon Tanzanite Gemstone 2.30 CaratsOne 2. 30 carats stepped octagon tanzanite, blur violet exceptional color, SI1 clarity, cut grade excellent, measuring 7. 5 mm wide, 9 mm long, 5. 1 mm deep; with excellent polish and excellent symmetry. The proportions of the tanzanite are as follows: total depth 68%, table width 40%. The overall quality rating of this tanzanite is 888 out of 1000. Cut by Steve Moriarty. Customize a Ring or Pendant with This Gemstone? Did you know that we design