NYC Diamond Dealer Accused of Lab-Grown Diamond Swaps
Manashe Sezanayev faces felony charges of fraud and grand larceny for allegedly replacing three natural diamonds with lab-grown ones.

Manhattan DA Alvin Bragg Jr. said 41-year-old Manashe Sezanayev of Queens, New York, was indicted in New York State Supreme Court on two counts of second-degree grand larceny, one count of first-degree scheme to defraud—both felonies—as well as three counts of third-degree criminal possession of a forged instrument, a misdemeanor.
Sezanayev, better known as “Mike,” operates Rachel’s Diamonds (a.k.a. Rachel’s Lab Grown Diamonds) on Manhattan’s 47th Street.
According to court documents and statements made on the record in court, on Feb. 5, a diamond merchant came to Sezanayev’s office with two natural diamonds Sezanayev claimed to be interested in buying.
The stones were valued at approximately $185,000 and $75,000.
When Sezanayev turned his back to the dealer to weigh the stones on the scale, he allegedly swapped them out for two lab-grown diamonds that had been recut to mimic the natural diamonds’ weight and quality.
The lab-grown diamonds, which are worth significantly less than their natural counterparts, also had been fraudulently inscribed with report numbers for natural diamonds graded by the Gemological Institute of America.
Sezanayev allegedly pulled off another switch the following month, according to court records.
On March 27, Sezanayev told another diamond merchant that he had a customer interested in purchasing a diamond valued at about $200,000.
Sezanayev then allegedly purchased a lab-grown diamond that was recut to mimic the $200,000 natural diamond and inscribed with a fraudulent GIA report number.
The following week, on April 2, the merchant met with Sezanayev and his purported customer and Sezanayev examined the diamond.
It was only later that the merchant learned that the diamond Sezanayev returned to him was a lab- grown stone, according to court records.
Sezanayev has pleaded not guilty in the case and his attorney, Queens-based Boris Nektalov, told National Jeweler on Tuesday that his client is “awaiting his day in court.”
In the press release announcing Sezanayev’s indictment, the Manhattan DA’s office thanked both the New York Police Department and GIA for aiding in the investigation.
A GIA spokesman said Tuesday, “We are grateful that we were able to assist the Manhattan District Attorney’s office with the investigation … For many years, GIA has provided training and investigation assistance to law enforcement in the U.S. and around the world. This is part of our mission to protect consumers and our work to meet the industry’s needs.”
He also noted that in addition to the GIA iD100, the lab’s desktop diamond tester, the lab offers four services to match a loose diamond to its GIA report.
They are: GIA Report Check; GIA Report Confirmation Service, which became available at all GIA labs earlier this year; GIA Match iD, an inscription viewing instrument that uses AI; and the lab’s Update Service, in which GIA-graded diamonds can be submitted for re-evaluation.
In 2017, he was one of a dozen men charged with perpetrating a series of frauds that ultimately cheated diamond wholesalers out of more than $9 million in goods.
He pleaded guilty to one count of conspiracy to commit wire fraud in 2018 and was sentenced to 366 days behind bars, court records show.
According to the online database for the Federal Bureau of Prisons, Sezanayev was released from prison in December 2019.
The Latest

Moses, who started at GIA’s Santa Monica lab in 1976, will leave the Gemological Institute of America in May.

Increased competition, falling lab-grown diamond and moissanite prices, and the rising cost of gold took a toll on the moissanite maker.

The earrings, our Piece of the Week, feature pink tourmalines as planets orbiting around an aquamarine center set in 18-karat rose gold.

Every jeweler faces the same challenge: helping customers protect what they love. Here’s the solution designed for today’s jewelry business.

“The Price of Freedom” campaign video for International Women’s Day confronts the quiet violence of financial control.


Also, a federal judge has ordered that companies that paid tariffs implemented under the IEEPA are entitled to refunds.

The ever-growing collection, which just expanded with the addition of Olga of Kyiv, features cameos of 12 women from history.

With refreshed branding, a new website, updated courses, and a pathway for growth, DCA is dedicated to supporting retail staff development.

We asked a jewelry historian, designer, bridal director, and wedding expert what’s trending in engagement rings. Here’s what they said.

The annual event will be held in Orlando, Florida, from Sept. 14-17.

The “Outlander” star modeled for the digital cover of the magazine’s spring issue, which features a story on her relationship with jewelry.

This year’s annual congress, which will mark the confederation’s 100th anniversary, will take place this fall in Italy.

Beverly Hills was chosen as the location for the brand’s first store, designed as a “private residence for modern monarchs.”

Kering, Apple, and other retailers have reportedly temporarily closed stores in the Middle East region in light of the recent conflicts.

Beth Gerstein discusses the vibe of the new store, what customers want when fine jewelry shopping today, and the details of “Date Night.”

Nearly half of buyers are prioritizing silver and fashion collections this season, organizers said.

The “Live Now. Polish Later.” campaign features equestrians wearing the brand’s jewels while galloping across the icy plains of Kazakhstan.

The precious metals provider has promoted Jennifer Ashworth to the role.

Nelson will be honored as the inaugural grant winner at the Gem Awards gala on March 13.

Experts from India weigh in the politics, policies, and market dynamics for diamantaires to monitor in 2026 and beyond.

The American precious metals refiner’s day-to-day operations remain the same post-acquisition.

These aquamarine jewels channel the calming energy of the March birthstone.

The “Innovative Design” category and award will debut in the Spectrum division of this year’s AGTA Spectrum & Cutting Edge Awards.

Diamond jewelry was the star of the event formerly known as the SAG Awards.

Consumers were somewhat less worried about the future, though concerns about rising prices and politics remained.

Foerster is this year’s Stanley Schechter Award recipient.

Sponsorships and tickets to the annual fundraising event, set for May 31, are available now.























