Method and apparatus for identifying gemstones, particularly diamonds
US5118181A · kind A · utility
52Cited by
1References
23Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 19, 1990 |
| Grant date | Jun 2, 1992 |
| Priority date | — |
| Expiry date | Oct 19, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2021/6417
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method of identifying a gemstone, particularly a diamond by: exciting the gemstone to cause it to emit luminescence radiation according to a luminescence spectrum unique to the respective gemstone, in which the luminescence intensity uniquely varies as a function of wavelength; measuring the level of the luminescence radiation at a plurality of preselected wavelengths of its luminescence spectrum; and utilizing the levels of the luminescence radiation at the preselected wavelenths to identify the respective gemstone and to distinguish it from other gemstones.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.