Process for determining a gemstone cut with high reflection, process for grinding a gemstone with high reflection and cut gemstone with high reflection
Номер патента: DE19734036A1
Опубликовано: 11-02-1999
Автор(ы): Helmut Buerger
Принадлежит: Helmut Buerger
Опубликовано: 11-02-1999
Автор(ы): Helmut Buerger
Принадлежит: Helmut Buerger
Реферат: 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 DEG . The lower part main facet angle is between 41 DEG and 46 DEG and the upper part main facet angle corresponds to an angle from a group of predetermined preferred angles. Said 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.
Gemstone cut grading method and apparatus
Номер патента: US20140067331A1. Автор: Daniel Benjano. Владелец: Danog Properties and Investments Ltd. Дата публикации: 2014-03-06.