An 18ct white gold chalcedony, and coloured diamond 'Sensuale' dress ring, by De Grisogono

An 18ct white gold chalcedony, and coloured diamond 'Sensuale' dress ring, by De Grisogono Of asymmetrical design, set with a large oval cabochon chalcedony, within a brilliant-cut black diamond surround, <i>European Convention mark, finger size O, black diamonds not tested for natural colour origin</i> Signed De Grisogono, no. B64267