6.55 Carats Stepped Shield TanzaniteOne 6. 55 carats stepped shield tanzanite, blue violet vivid color, SI1 clarity, cut grade excellent, measuring 10 mm wide, 14 mm long, 7. 6 mm deep; with excellent polish and excellent symmetry. The proportions of the tanzanite are as follows: total depth 76%. Tanzanites are enhanced by heating. Cut by Steve Moriarty. Overall quality rating of this tanzanite is 881 out of 1000. Customize a Ring or Pendant with This Gemstone? Did you know that we