A tourmaline and diamond ring, by Tiffany & Co., 1991 The tapering 18 carat gold band centred by an oval cabochon green tourmaline, flanked by duos of brilliant-cut diamonds, between oval cabochon pink tourmaline shoulders, to a ridged hoop, diamonds approx. 0.35 carat total, signed Tiffany & Co, maker's mark, UK import mark, ring size N