Source: GIA Courtesy of israelidiamond.co.il

Police in Surat detained a diamond trader and seized 24 GIA reports and five lower-quality diamonds inscribed with numbers that matched five reports for higher-quality stones.   Authorities also seized the laser machine believed to have been used to inscribe the stones with fraudulent report numbers.
Be careful out there!

Here is the GIA Press Release:

CARLSBAD, Calif. – Sept. 13, 2021 – In mid-August, as reported in the media, police in Surat, India, uncovered a fraudulent scheme involving counterfeit inscriptions linking lower-quality diamonds to GIA diamond grading reports for higher-quality stones. In the investigation, police seized several diamonds and what appeared to be several GIA diamond grading reports.
 
The police requested assistance from GIA India Laboratory Pvt. Ltd. (GIA India) in determining the characteristics of the seized diamonds and reports. GIA India determined that some of the reports were legitimate GIA reports and some were counterfeits using legitimate GIA report numbers. GIA India also determined that of the diamonds presented with reports stating they were natural, untreated diamonds, most were treated or laboratory-grown diamonds.
 
GIA India is continuing to cooperate with local authorities. In addition, GIA India requested the police conduct the necessary investigations and take the necessary steps to identify and arrest the perpetrators of these malicious acts against GIA and the innocent people who this fraud may have deceived.
 
This unfortunate situation reinforces why it is important, especially in any transaction where the buyer does not have a trusted relationship with the seller, to have the diamond grading report updated by GIA before completing a purchase.