OPTICALLY PERMEABLE MARK FOR PRECIOUS STONES MARKING Russian patent published in 2020 - IPC G09F3/00 

FIELD: marking means.

SUBSTANCE: invention relates to marks used for marking precious stones, including diamonds or brilliants, and carrying information for various purposes, for example identification codes, in particular to labels invisible to the naked eye, using magnifying glass and microscopes of various types, in particular to marks located inside the volume of diamonds or brilliants without affecting their characteristics, leading to damage to the quality of diamonds or brilliants. Said technical result is achieved by using an optically permeable mark located inside a diamond or brilliant volume containing predetermined encoded information and consisting of a given set of optically permeable elements of micron or submicron size, which are areas of high concentration of atomic defects of the crystal lattice of diamond or brilliant, atomic defects of the diamond or brilliant crystal lattice are vacancies and internodes, wherein said information is encoded in at least two regions of high concentration of said atomic defects. Information is encoded in mutual spatial arrangement of said regions, in variations of concentration of atomic defects in said regions, in variations of dimensions or geometric shapes of said regions created by exposing the diamond to optical radiation focused in the focal region located in the area of the intended placement of said mark areas.

EFFECT: technical problem of the disclosed solution lies in widening the field of application of the mark on diamonds with different content of natural impurities, including nitrogen with achieving a technical result consisting in solving said problem with simultaneous simplification of the process of mark application and reduction of possible effect on properties of stone during marking.

5 cl, 3 dwg