A wonderful larger B grade black tourmaline from Brazil that weighs 13 oz. B grade means that this tourmaline is made up of many smaller tourmalines. This gives it a less uniform shape and makes it a little more fragile. A B grade black tourmaline can flake off little pieces when handled. You also get a much larger tourmaline for the price! Size: 3 1/2" long x 2 1/8" wide.