Oval Onyx Ring with Brilliant Halo3D design of a ring with an estimated weight of approximately 4.0 g in 18K gold (Au750). The piece features one oval cabochon-cut onyx measuring 13 × 9 mm, surrounded by 20 brilliant-cut diamonds of 2.0 mm. The halo arrangement enhances the contrast between the deep black onyx and the sparkle of the diamonds, creating a sophisticated and timeless look. Dimensions are shown in the image (in millimeters).