MARKING OF DIAMONDS OR PRECIOUS STONES WITH USE OF COLLECTION OF LINES Russian patent published in 2003 - IPC

FIELD: marking of precious stones. SUBSTANCE: marking of diamonds or precious stones with use of collection of lines is meant for increase of quality of their selection. It includes stage of formation of collection of lines on surface of diamond or precious stone. Lines in this case form sign or signs which can not be recognized by naked eye. Lines generate visible diffraction effect under certain conditions of illumination and magnification. EFFECT: increased quality of identification of diamonds and precious stones. 31 cl, 3 dwg