European Cut Diamond & Onyx Accent Cocktail RingEuropean Cut Diamond Onyx Accent Cocktail Ring. This modern cocktail ring features a . 92 carat Old European cut diamond with . 55 carats of accent diamonds and 1. 15 carats of square cut onyx all set in platinum. The center diamond is bezel set and surrounded by an incredible array of accent stones. The channel set onyx follows two mirrored paths that contain many of the pave diamond accents. The shoulders of the ring also have amazingly detailed