Unheated Tanzanite Gemstone 8.20 CaratsOne 8. 20 carats step emerald cut tanzanite, natural unheated color, blue violet with red flash, VS clarity, cut grade excellent, measuring 10. 5 mm wide, 13. 2 mm long, 8. 4 mm deep; with excellent polish and excellent symmetry. The proportions of the tanzanite are as follows: total depth 80%, table width 36. 2%. Cut by Steve Moriarty. This will heat to a top gem color that would grade in the high 900s. Natural Tanzanite Emerald Cut 8. 20 Carats With