4.81 Art Deco Tourmaline & Ruby Ring with Diamonds in 14k4. 81 Art Deco Tourmaline Ruby Ring with Diamonds in 14k. This amazing Art Deco cocktail ring features a 4. 81 carat emerald cut green tourmaline wrapped in a halo of calibre cut rubies and small diamonds. The ring is finished in 14 karat white gold. This antique ring does have a chipped ruby which has been considered when pricing. The unusual combination of colors is very special and works wonderfully.