Tanzanite

Intergrown, diverging Tanzanite crystals. The crystals themselves are perfect, both gemmy with great luster and undamaged. The formation is spectacular in aesthetics and, I am told, in rarity, with only a dozen or so of this type known and the only other one like this I have seen was repaired down the middle. Blue from the front and purple when viewed from the sides. Illustrated in the Sept.-Oct. 2009 issue of the Mineralogical Record (Figure 103, page 394). Natural, unheated gem Tanzanite crystal. 51 carats in weight, 4.4 x 3 x 1.2 cm.