Out of our recent parcel of super rare gemmy unheated tanzanites, this is my favorite. It’s glassy, has excellent shape and clarity, but the colors and rainbows sets this one apart for me. It will look great in your next piece of custom jewelry or wire wrap.
It measures 18 x 8 x 7 mm and weighs 2.4 grams.
Seen here in front of a polarized computer screen:
And here in natural sunlight: