Martini Style Diamond Ring with Round Halo in 18kt White Gold. (D. 1/2 carat total weight) This item is a SEMI-MOUNT and it comes with NO CENTER STONE as shown but it will accommodate a 5.8mm round center stone.Metal Type: 18kt goldMetal Color: WhiteStone Type: Diamond - WhiteCenter Stone Shape: RoundStyle: Halo style Weight: 3.83Accent Diamond-Shape: Round Full CutAccent Diamond-Weight: 0.45