A 53-year-old man was sentenced to six years and four months in state prison for replacing the diamonds on his clients’ jewelry with fake stones, prosecutors said Friday.

On Oct. 25, Charles Jayson Hanson of Newport Beach was found guilty of five counts of felony grand theft and one misdemeanor count of petty theft, as well as sentencing enhancements for aggravated white-collar crime.

Hanson was first accused after a couple he knew gave him an engagement ring to upgrade. Prosecutors said he who ran now-shuttered Stoned Jewelry at the South Coast Connection. They paid him $16,000 for the services but when it was returned they discovered the diamond had been replaced with a cubic zirconia stone, according to the Orange County District Attorney’s Office.

Newport Beach police detectives later found more victims with similar stories. According to court records, the value of the thefts ranged from $100,000 and $500,000.

Some of Hanson’s victims were present at his sentencing Friday and delivered statements to the court.

“I was especially appalled that he had the nerve to bring my fake diamonds to my home and was especially proud to show them to me,” one victim, named only as Anya D. by the prosecutor’s office. “Unfortunately, I have lost confidence and trust for those who are in these positions of trust.”

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