14K Gold "Engine Turn" Design Ring

14K yellow and white gold 1950s 'Engine Turning" design ring. "Engine Turning" is a term they used to describe the design in the 1920s--a concentric, curved design. The ring is 14k white gold with a 14k yellow gold polished border.Border is 0.80mm , inside white gold station is 6.88mm. The ring weighs 7.15grams and is 8.15mm wide by 1.60mm thick. U.S. Size 6.5