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There are practical reasons why the GIA certificate should have the laser inscription mentioned on it.
Firstly it links the stone to the report and gives the buyer an easy reference for identification.
Also if the report and the stone have corresponding GIA number and most importantly, the logo. you can be sure it is authentic.
Here is an example of a stone recently submitted to the DCLA in Sydney Australia with a false GIA logo and number.
This has been reported by the DCLA to the Diamond club and GIA.
Mike Cohen
Diamond Certification Laboratory of Australia
www.dcla.com.au