Method and apparatus for placing identifying indicia on the surface of precious stones including diamonds

  • US 4,392,476 A
  • Filed: 12/23/1980
  • Issued: 07/12/1983
  • Est. Priority Date: 12/23/1980
  • Status: Expired due to Term
First Claim
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1. A method for providing an identifying indicium to a diamond comprising:

  • applying a laser beam to a surface of said diamond;

    and controlling said laser beam to enable said laser beam to inscribe into said diamond surface an indicium including;

    intermittently moving said laser beam to successive positions on said diamond surface along a path corresponding to said indicium, said beam at each position covering a diamond surface area overlapping the diamond surface area covered by the beam at the immediately preceding position on said indicium;

    and adjusting the laser beam power to graphitize and inscribe said diamond surface at each of said positions.

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