.Paraiba Tourmaline ring. The ring is made of 18K white and yellow gold and weighs 10.20 DWT (approx. 15.86 grams). It also has one pear shaped tourmaline weighing 17.13 CTTW and green-blue in color, and 110 round G-color, VS-clarity diamonds weighing 0.95 CTTW. This Ring comes with a GIA Tourmaline Report. This is a copper and manganese bearing tourmaline. Incredibly rare!