72.00 ct ct. Mine Rough 100% Unheated Natural Tanzanite Rough Gemstone.This is a genuine Unheated Tanzanite Rough weighing 72.00 carats. ( Size: 22.0 mm x 21.0 mm x 18.0 mm ) It is rough and would make a great pendant, or even a big ring. This was part of my personal collection which I never had mounted. I hope the winning bidder enjoys it as much as I did. Unheated Tanzanite Rough stone is simply breathtaking ! It is ready to be made into a gorgeous piece of fine jewelry, collections or gifts! - you are going to Love this Unheated Tanzanite Rough.