Cut for gemstone
US11452346B2 · kind B2 · utility
0Cited by
11References
19Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 9, 2018 |
| Grant date | Sep 27, 2022 |
| Priority date | — |
| Expiry date | Oct 9, 2038 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA44C17/001
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.