Special Cutting. Trilliant Tanzanite Gemstone 2.81 CaratsA trillant shaped Tanzanite gemstone with a "excellent" grade cut and blue violet vivid color. One 2. 81 carats trilliant cut tanzanite, blue violet vivid color, SI1 clarity, cut grade excellent, measuring 9. 2 mm wide, 9. 2 mm long, 5. 8 mm deep; with excellent polish and excellent symmetry. The proportions of the tanzanite are as follows: total depth 63%, table width 48%. Cut by Steve Moriarty with a brilliant style pavillion and a step cut crown.