Tanzanite GemstoneOne 2. 45 carats pear shape brilliant cut tanzanite, violet blue exceptional color, VS1 clarity, cut grade good, measuring 6 mm wide, 10 mm long, 5 mm deep; with good polish and very good symmetry. The proportions of the tanzanite are as follows: total depth 83. 3%. The overall quality rating of this tanzanite is 892 out of 1000. Tanzanite is color enhanced by heating,. Customize a Ring or Pendant with This Gemstone? Did you know that we design custom