NYC Diamond Dealer Pleads Guilty to Lab-Grown Diamond Swaps
Manashe Sezanayev pleaded guilty to grand larceny and is expected to receive five years’ probation when he’s sentenced in May.

On Feb. 27, 41-year-old Manashe (Mike) Sezanayev of Queens, New York, pleaded guilty in a New York State Supreme Court to one count of grand larceny in the second degree.
Sezanayev, the owner of Rachel’s Diamonds on 47th Street in Manhattan, was indicted last July in New York State Supreme Court on two counts of second-degree grand larceny and one count of first-degree scheme to defraud, which are both felonies, as well as three counts of third-degree criminal possession of a forged instrument, a misdemeanor.
His sentencing date is May 5, according to the DA’s office.
He is expected to receive five years of probation and to make restitution in the amount of $200,000, which Manhattan DA Alvin L. Bragg Jr. said has already been paid.
When Sezanayev turned his back to the merchant to weigh the stones, he allegedly swapped them for two lab-grown stones intentionally cut to mimic the natural stones, both fraudulently inscribed with Gemological Institute of America report numbers for natural diamonds.
According to court records, the next month, Sezanayev told another diamond merchant that he had a customer looking to purchase a diamond worth around $200,000.
Sezanayev purchased a lab-grown diamond re-cut to mimic the $200,000 natural diamond he claimed to be interested in, also inscribed with a fraudulent GIA report number.
He brought the lab-grown stone to a meeting with his alleged customer and the merchant, and while evaluating the natural stone, Sezanayev made the swap.
The merchant did not realize his natural diamond had been swapped for a lab-grown diamond until later.
The DA’s office said the $200,000 diamond was returned to the victim.
“Manashe Sezanayev is facing accountability for stealing diamonds from merchants and replacing them with fake stones,” Bragg said.
“We will continue to prosecute those who take advantage of consumers and conduct business deals in a dishonest manner.”
This is the second time Sezanayev has pleaded guilty to a diamond-related crime.
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

This round of tariff refunds is for importers that have sued over IEEPA tariffs in the Court of International Trade and won.

It revisits the brand’s most requested silhouettes, from "Pillow"-set necklaces and bracelets to "Signature"-set rings and earrings.

The trade-only event includes buying opportunities as well as educational sessions on artisanal mining, the new Paraíba source, and more.

Experience gemstones with greater precision and comfort than ever before.

Ara Chanakian, a jeweler at Pattons, took home top honors in every category at Jewelers of Louisiana’s annual jewelry design competition.


The live charity benefit sale in Nashville will also feature gowns, boots, and other memorabilia from the country music legend.

Sponsored by Overnight Mountings

Submit your pieces for a chance to win in this year's competition.

The supplier organization recently joined JA and JVC to have more input on political issues affecting the jewelry industry.

Blue Nile, a Signet Jewelers-owned brand, is now Royal Asscher’s exclusive licensed retailer in North America.

“Royal Oak” pays homage to the brand’s most popular watch model using 18-karat gold as well as diamonds, emeralds, and sapphires.

As part of the transition, Joseph Nicosia has stepped into the role of COO.

Participants now have until Oct. 14 to complete their submissions.

The alleged thieves used crow bars and sledgehammers to smash into jewelry stores across the state.

Ahead of the holidays, Smith urges jewelers to take a hard look at who’s buying jewelry, what they’re purchasing, and who’s stopped buying.

In the new consumer-facing campaign, four fashion and lifestyle creators share the stories behind their natural diamond pieces.

FGI President John Orrico is also leaving the company after more than 13 years.

The 2026 edition will feature presentations on alternative materials and design trends, as well as pop-up activations on the show floor.

It is the last fully operational diamond mine in Canada following the recent closures of Ekati and Diavik.

These jewels stood out at Bonhams’ sale of the cat-loving tech entrepreneur’s collection of objects depicting the feline form.

The fine jewelry brand has expanded the collection that debuted at Couture with four new designs based on its most popular styles.

The AGTA president was elected for a two-year term on the board of directors.

The partnership, a pledge to protect Africa’s Okavango River Basin, has been extended for an additional five years.

The new facility, its first outside of Thailand, will boost its manufacturing capacity by 50 percent.

The special-edition “Dream” pendant, our Piece of the Week, was created to mark Hearts On Fire’s 30-year milestone with 30 diamonds.

YouGov’s 2026 U.S. Most Recommended Brands report’s out, and a fast-fashion giant is sitting at No. 1 while Rolex is just shy of the top 5.

Proceeds from its jewelry raffle will benefit an organization working in India to combat silicosis, a lung disease affecting stone cutters.
























