Eternity rings fashioned with U-shape settings are a smart design, as they allow both the diamonds and deep blue sapphires to brightly shine. U-prong settings developed from variants on the four prong setting, in answer to the demand for a setting less likely to snag on clothing or other objects & better designed to allow more light to pass through the gems. This setting works by securely keeping the diamonds into place slightly above the bottom of the U. Our eternity diamond rings are available in 14 karat and 18 karat white, yellow, and rose gold or immaculate .950 platinum. Choose from a vast range of carat weights in stock for most styles, in GH/I1, GH/SI, & FG/VS color and clarity.