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OwnerHelmut Buergerinventor
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The invention relates to a method for determining a high-reflection cut of a gem, a method for cutting a high-reflection gem, and a cut high-reflection gem. According to the invention, the gems have at least three lower part main facets and at least three upper part main facets, the angle between the lower part main facets and the girdle plane being greater than the angle between the upper part main facets and the girdle plane. A table replaces the upper part main facets at an angle of 0°. The lower part main facet angle is between 41° and 46° and the upper part main facet angle corresponds to an angle from a group of predetermined preferred angles. The group of angles is determined according to the average refraction of light n (between 1.50 and 3.00) of the raw material being cut and the lower part main facet angle.
A cut gem including high reflection with at least three principal pavilion facets and at least three principal crown facets, an angle between the principal pavilion facets and a girdle surface being greater than an angle between the principal crown facets and the girdle surface, such that at angle 0° a table is formed instead of the principal crown facets, with principal pavilion facet angle (UHFW) ranging between 41° and 46° and principal crown facet angle (ORFW) corresponding to an angle selected from a group of predetermined, preferred angles, which are subject to mean optical refraction n ranging between 1.50 and 3.00 of a raw material to be cut, and principal pavilion facet angle (UHFW), said group of predetermined, preferred angles comprising the following angles:
A cut gem including high reflection with at least three principal pavilion facets and at least three principal crown facets, an angle between the principal pavilion facets and a girdle surface being greater than an angle between the principal crown facets and the girdle surface, such that at angle 0° a table is formed instead of the principal crown facets, with principal pavilion facet angle (UHFW) ranging between 41° and 46° and principal crown facet angle (OHFW) corresponding to an angle selected from a group of predetermined, preferred angles, which are subject to mean optical refraction n ranging between 1.50 and 3.00 of a raw material to be cut, and principal pavilion facet angle (UHFW), said group of predetermined, preferred angles comprising the following angles:
Dependencies are inferred from the claim text.