Abstract: A light guide element for a lighting device is elongated in the direction of a main axis and includes a light coupling surface extending transversely to the longitudinal direction and a light emission surface radiating transversely to the longitudinal direction, and two or more light guides stacked on top of one another, wherein a partial region of the wall of the individual light guides extending in the longitudinal direction is structured and/or blackened.

Abstract: The invention relates to a light guide element for a lighting device, wherein the light guide element is elongated in the direction of a main axis (A) and comprises a light coupling surface extending transversely to the longitudinal direction and a light emission surface radiating transversely to the longitudinal direction, and two or more light guides stacked on top of one another, wherein a partial region of the wall of the individual light guides extending in the longitudinal direction is structured and/or blackened.

Abstract: A gemstone has a faceted crown which is inclined with respect to the main axis and which is defined on the one end by a preferably flat table and on the other hand by a peripheral edge of the gemstone. A faceted pavilion is inclined with respect to the main axis, adjoins the peripheral edge, and converges to a tip. The facets (3) of the crown (2) are all inclined at the same crown angle (&bgr;) with respect to the main axis (1), while the facets (7, 7′) of the pavilion (6) are inclined at two different pavilion angles (&agr;1, &agr;2) with respect to the main axis (1). The first set of facets (7) of the pavilion (6) which are inclined at a first pavilion angle (&agr;1) extend to the peripheral edge (5), and the second set of facets (7′) of the pavilion (6) which are inclined at a second pavilion angle (&agr;2) start from the tip (8) without reaching the peripheral edge (5).