Natural Unheated Antique Cushion Tanzanite Gemstone 43.82 CaratsWhen it comes to rarity of the gems available in the market this will rank as one of the rarest. One 43. 82 carats antique cushion tanzanite, EYE CLEAN clarity, cut grade excellent, measuring 18. 7 mm wide, 23. 4 mm long, 14 mm deep; with excellent polish and excellent symmetry. The proportions of the tanzanite are as follows: total depth 75%, table width 41%, and a girdle thickness of medium to slightly thick. The tanzanite also has a crown angle of