Tension Settings | Tension Set Rings: Diamond, ruby and sapphire in tension set ring is popular as engagement setting and also as anniversary ring. The tension set ring concept is more than 40 years old. More than 50,000 tension setting/tension set diamond rings have been sold. Our tension set diamond rings are manufactured by Gelin and Abaci (G.A.I.) and not by Steven Kretchmer. There have been no known diamond losses due to design or craftsmanship of tension set ring. Every tension set ring is closely inspected to ensure it meets the high standards. Each tension ring is custom made for a specific diamond size and finger size. Each tension product is manufactured with special alloys with a sophisticated technique which enables the metal to retain its memory. Tension set products have anywhere from 65 to 95 pounds pressure on the center stone.