925 sterling silver diamond cut grapevine design ring with a gorgeous faceted solitaire marquise pink tourmaline stone. The stone set in the middle measures 3/16 inch wide. It is available in a size 6.5. Tourmaline is a name applied to a family of related minerals with widely varying properties. Tourmalines make very popular jewelry stones and come in an amazing range of colors, including multi-color zones. This gemstone can be found in a wide variety of colors. It is the birthstone for October.