Vintage Art Deco Sapphire Cabochon in 18k Yellow Gold Ring. This vintage yellow gold sapphire cabochon ring is made with 18k gold and contains one stunning Sapphire in a beautiful medium/deep Blue color, placed in a four prong setting. The band feels very sturdy and comfortable to wear every day. MARKINGS AND HISTORY: 18K marked on the outside of the band SIZE: 6 ERA: Most likely vintage from the 1940's. OVERALL CONDITION: Minor scuffs on the band but overall beautiful vintage condition GEMSTONES: 1 high-domed oval medium/deep Blue Sapphire cabochon. measuring approx. 6mm Long x 4mm Wide x 3mm Deep.