Three Stone Art Deco Diamond Ring in 20k White GoldThree Stone Art Deco Diamond Ring in 20k White Gold. This three stone diamond ring features 1. 73 carats of Old European cut diamonds set in 20 karat white gold. The diamonds are accented by French cut sapphires on the shoulders, as the three diamonds run vertically on this ring. It is worth mentioning that 20 karat white gold is not very common to see in Art Deco rings. This is a rare beauty that will be cherished for ages.