Art Deco Three Stone Diamond Ring in 18k White GoldArt Deco Three Stone Diamond Ring in 18k White Gold. This vintage three stone ring in 18 karat white gold features . 43 carats of diamonds in a classic Art Deco style. The diamonds are set in a line that sits atop your finger with large open spaces separating them from the fabulous detail on the outer edges. This open space creates a look where the center stones are almost floating in the wonderful engravings.