Pietra Di Luna Pink Tourmaline Diamond Cocktail Ring.  This iconic marquise-shaped cocktail ring features a 9.20 carat pink tourmaline and diamond accents in 18 karat white gold. The center stone has a rich, berry-magenta hue and is bezel set in white gold. Thirty-six (36) near colorless diamonds add a bright brilliance to the dark pink tourmaline center stone. Set on a sleek black enamel band, this stylish ring is full of mystery and beauty!