Gems and Jewelry, 2.2 x 0.9 x 0.6 cm (13 carats)
Umba Valley, Usumburu Mts., Tanzania
Ex. Marilyn Dodge
A superb, gem-quality Tanzanite that demonstrates the classic color change along a and b axes. It is exceedingly glassy and gemmy! The gem rough value here is considerable at $500 per carat wholesale in cutting rough - all you have to do is heat this to make it the deeper jewelry-type blue color and cut away. It should have a relatively high yield in stones from the large central zones.