18kt White and Yellow Gold Diamond Ring with Milgrain Detail and a Square Halo. (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 5.5mm princess cut center stone.Metal Type: 18kt goldMetal Color: Two-toneStone Type: Diamond - WhiteCenter Stone Shape: PrincessStyle: Halo style Weight: 4.92Accent Diamond-Shape: RoundAccent Diamond-Weight: 0.51