Abstract: The invention relates to a gemstone cut, comprising a crown having a flat table and main crown facets (10-12) being arranged around the table (1) and being inclined relative to the table, a girdle (5) at which the gemstone has its largest transverse dimension, and a pavilion adjoining the girdle from below the girdle and having main pavilion facets (7) around the girdle, whereby the number of the main pavilion facets is odd. The invention also relates to an article comprising a gemstone according to the invention and a method for improving the optical properties of a gemstone.

Abstract: The invention relates to a gemstone cut, comprising a crown having a flat table and main crown facets (10-12) being arranged around the table (1) and being inclined relative to the table, a girdle (5) at which the gemstone has its largest transverse dimension, and a pavilion adjoining the girdle from below the girdle and having main pavilion facets (7) around the girdle, whereby the number of the main pavilion facets is odd. The invention also relates to an article comprising a gemstone according to the invention and a method for improving the optical properties of a gemstone.

Abstract: A gemstone has a chaton cut, in which a crown adjoins a flat table and has facets that are inclined downwardly relative to the table all the way round, wherein the crown has main facets that extend substantially from the table as far as a girdle at which the gemstone has the largest transverse dimension. A pavilion of facets, preferably facets converging to a point, adjoins below the girdle. The gemstone consists preferably entirely of topaz, and the angle of the main facets relative to a cross-sectional face arranged parallel to the table is between 32.5° and 34.5°.

Abstract: Disclosed is a gem (1) that has a stellar appearance. Said gem (1) comprises a crown (2) having a plurality of crown facets, including a first group (6) of crown facets that taper in the direction of a girdle (4) and extend at an angle (a) of 22.5°±3°, preferably 22.5°+2° from the girdle plane (E), and a second group (7) of crown facets that adjoin the girdle (4) by their large side and extend at an angle (13) of 34°±3°, preferably 34°±2° from the girdle plane (E). Also disclosed is an arrangement comprising a gem.

Abstract: The invention relates to a gemstone (1) having a chaton cut, in which a crown (2) adjoins a flat table (5) and has facets (11, 12, 13) that are inclined downwardly relative to the table (5) all the way round, wherein the crown (2) has main facets (11) that extend substantially from the table (5) as far as a girdle (4) at which the gemstone (1) has the largest transverse dimension, and wherein a pavilion (3) of facets (8, 9, 10), preferably facets converging to a point, adjoins below the girdle (4), and wherein the gemstone (1) consists preferably entirely of topaz, wherein the angle of the main facets (11) relative to a cross-sectional face (7) arranged parallel to the table (5) is between 32.5° and 34.5°.