Blue CZ Royal Style Ring: Silvertone Take your look to new heights with Blue CZ Royal Engagement Ring: Silvertone. You may not be royalty, but you can certainly feel like it with this blue CZ and oval CZ engagement ring. Features a 3 carat oval cut CZ center stone surrounded by a starburst shape of sparkling smaller, round cut CZ stones. It is made of brass based, silvertone for the elegant gleam of platinum. The band is 2mm thick, and the entire ring weighs 4.8 grams. This silvertone ring is even available in sizes 4 through 12.