This u-shaped setting eternity band is a stunning example of the elegant contemporary black diamond trend in fine jewelry. U prong settings grew from variants on the four prong setting, owing to the demand for a setting less likely to snag on clothing or other objects and better engineered to allow more light to pass through the gemstones. This setting works by securely holding the gemstones into place slightly above the base of the U. Our eternity bands in immaculate .950 platinum can be set with your choice of precious gems, and we offer a vast selection of carat weights in stock for most designs, in GH/I1, GH/SI, and FG/VS colour and clarity grades.