Title:
METHOD OF MARKING A DIAMOND, MARKINGS FORMED FROM SUCH METHODS AND DIAMONDS MARKED ACCORDING TO SUCH A METHOD
Document Type and Number:
WIPO Patent Application WO/2021/000967
Kind Code:
A1
Abstract:
A process of forming a non-optically detectable authentication marking (110), includes the step of: applying a marking at a surface of a diamond (200) using a focused ion beam (FIB) writing process so as to provide a non-optically detectable authentication marking (110) which is formed by alteration in the optical characteristics of a portion of the diamond material at the outer surface of the diamond to form a marked portion; wherein the marking is optically invisible, and wherein the marking is viewable by an imaging method which provides an observable contrast between the portion of the diamond having altered optical characteristics and the non-marked portion of the diamond. The marking process can assist in the prevention of the counterfeiting of precious articles, and be of assistance in the incident of theft. A marking, a diamond, a process of viewing a marking on a diamond are further disclosed.
Inventors:
YIU YAU CHUEN (CN)
CHENG KA WING (CN)
HUI KOON CHUNG (CN)
CHENG KA WING (CN)
HUI KOON CHUNG (CN)
Application Number:
PCT/CN2020/104587
Publication Date:
January 07, 2021
Filing Date:
July 24, 2020
Export Citation:
Assignee:
MASTER DYNAMIC LTD (CN)
International Classes:
G06K9/00; B44C1/00
Foreign References:
| US20100054528A1 | 2010-03-04 | |||
| US4467172A | 1984-08-21 | |||
| CN1522422A | 2004-08-18 | |||
| CN101827713A | 2010-09-08 | |||
| CN109376832A | 2019-02-22 | |||
| US20170307537A1 | 2017-10-26 |
Other References:
See also references of EP 3994614A4
Attorney, Agent or Firm:
CHINA SINDA INTELLECTUAL PROPERTY LIMITED (CN)
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