The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 17, 2026
Filed:
Jan. 06, 2021
Applicant:
DE Beers Uk Ltd, London, GB;
Inventors:
Peter Lanigan, Berkshire, GB;
Colin Mcguinness, London, GB;
Assignee:
De Beers UK Ltd, London, GB;
Primary Examiner:
Int. Cl.
CPC ...
G01N 21/87 (2006.01); G01N 21/64 (2006.01); G01N 21/88 (2006.01);
U.S. Cl.
CPC ...
G01N 21/87 (2013.01); G01N 21/64 (2013.01); G01N 21/6408 (2013.01); G01N 21/643 (2013.01); G01N 2021/6413 (2013.01); G01N 2021/8841 (2013.01);
Abstract
A method of characterising a composition of a gemstone comprises irradiating an upper portion and a lower portion of the gemstone with one or more pulses of ultraviolet radiation at a wavelength of substantially 225 nm or less; capturing luminescence emitted by the upper portion of the gemstone and luminescence emitted by the lower portion of the gemstone in one or more time windows having a predetermined relationship with the or each pulse; and comparing properties of the captured luminescence from the upper and lower portions. A composition of the gemstone is characterised, based upon the comparison.