Blue Violet Exceptional Oval Tanzanite Gemstone 4.05 CaratsOne 4. 05 carats oval tanzanite, blue violet exceptional color, 10X LOUPE CLEAN clarity, cut grade excellent, measuring 8. 3 mm wide, 10. 5 mm long, 6. 5 mm deep; with very good polish and very good symmetry. The proportions of the tanzanite are as follows: total depth 78%. Tanzanites are enhanced by heating. Overall quality grade 887 out of 1000. Customize a Ring or Pendant with This Gemstone? Did you know that we design custom Tanzanite jewelry? We