This is a huge Tanzanite specimen!! It weighs in at 49.8 grams (249 carats!) It has been heat treated to bring out the blue color, as is customary with this particular stone. It has a very vibrant blue hue with some rainbows visible on the main face. It also has a little Diopside crystal growing on top of it as well.
This piece measures approximately 7.2cm x 2.9cm x 1.5cm