Abstract: The present invention generally relates to a jewelry ring (1) and a method for the production of such a jewelry ring (1). The jewelry ring consists of a first ring (2) having an inner surface area, a second ring (3) and a sliding ring (4), the latter is located between the first ring (2) and the second ring (3) to ease a preferably frictionless twistability of the two rings to each other.

Abstract: The cut gem, in particular the diamond, has a predetermined number of cut facets in the crown (10) and in the pavilion about a central axis of geometric symmetry. The facets (25 to 27) are disposed about said axis of symmetry in a hexagonal arrangement. This geometric axis of symmetry preferably corresponds to one of the ternary crystallographic axes of the diamond. The girdle (12) separating the crown from the pavilion has a contour (20) of lobed shape with six rounded projecting portions and six rounded hollow portions (21, 22). The gem thus cut permits obtaining the original optical effects of brilliance and dispersion of light.