Blue Violet Vivid Antique Cushion Tanzanite Gemstone 3.04 CaratsOne 3. 04 carats antique cushion tanzanite, blue violet vivid color, 10X LOUPE CLEAN clarity, cut grade very good, measuring 7. 7 mm wide, 10. 2 mm long, 5. 1 mm deep; with good polish and very good symmetry. The proportions of the tanzanite are as follows: total depth 66%. Tanzanites are color enhanced by heating. Overall quality grade 861 out of a 1000. Customize a Ring or Pendant with This Gemstone? Did you know that we design custom Tanzanite