29.90 ct. 5.98 gram. Mine Rough 100% Unheated Natural Tanzanite Rough Gemstone. This is a genuine Unheated Tanzanite Rough weighing 29.90 carats. ( Size: 20.0 mm x 15.0 mm x 10.0 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 thisUnheated Tanzanite Rough.