Method for cutting natural and/or man-made diamonds
US6892720B2 · kind B2 · utility
Inventors
Key dates
| Filing date | Apr 15, 2003 |
| Grant date | May 17, 2005 |
| Priority date | — |
| Expiry date | Apr 23, 2023 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA44C17/001
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
A method for producing a diamond includes forming a table lying in a table plane; forming crown facets that are oriented at an angle of between 26° and 35° relative to the table plane; forming upper pavilion (UP) facets below the crown facets at an angle of between 45° and 80° relative to a girdle plane lying between bottoms of the crown facets and tops of the UP facets; and forming a set of lower pavilion (LP) facets between bottoms of the UP facets and the culet at an angle of between 38° and 44° relative to the girdle plane. The UP and LP facets form a rib line positioned between one-fifth and four-fifths the distance between the girdle plane and the culet, such that the UP facets extend between 20% and 80% of the distance between the girdle plane and the culet.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.