Crime

NYC Diamond Dealer Pleads Guilty to Lab-Grown Diamond Swaps

CrimeMar 04, 2025

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.

Stock image of a gavel
Manashe Sezanayev of Queens, New York, who was accused of replacing three natural diamonds with lab-grown ones, has pleaded guilty to defrauding two diamond merchants.
New York—A dealer based in New York City’s Diamond District has pleaded guilty to defrauding two other diamond merchants by replacing natural diamonds with lab-grown ones, the Manhattan District Attorney’s Office announced last week.

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.

 Related stories will be right here … 

According to court documents and statements made on the record in court, last February, a diamond merchant brought two natural diamonds to Sezanayev’s office that Sezanayev claimed to be interested in buying, valued at approximately $185,000 and $75,000.

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

Pair of Ippolita Lollatini earrings
MajorsDec 19, 2025
MadaLuxe Group Acquires Ippolita

The luxury goods company said founder Ippolita Rostagno will remain at the brand’s helm.

Bulgari CEO Laura Burdese
MajorsDec 19, 2025
LVMH Names New Bulgari CEO

Laura Burdese, who joined the Italian luxury brand in 2022, will take on the role in July.

Harwell Godfrey Lil Buddies
EditorsDec 19, 2025
2025 Jewelry Superlatives: A Yearbook-Style Year in Review

The National Jeweler editors revisit the most noteworthy industry happenings and design trends from 2025.

Recipients Collage 2025 - NJ (1872 x 1050 px) (1872 x 1052 px).png
Brought to you by
Impacting Tomorrow Today

How Jewelers of America’s 20 Under 40 are leading to ensure a brighter future for the jewelry industry.

Front of Jean Schlumberger’s ‘African Cat’ brooch
AuctionsDec 19, 2025
Jean Schlumberger’s ‘African Cat’ Is Purr-Fection

Need a gift for the cat lover who has everything? Look no further than our latest Piece of the Week.

Weekly QuizDec 18, 2025
This Week’s Quiz
Test your jewelry news knowledge by answering these questions.
Take the Quiz
Audemars Piguet Grosse Pièce
AuctionsDec 18, 2025
Audemars Piguet Reclaims Historic Pocket Watch at Auction

It purchased the “Grosse Pièce,” an ultra-complicated Audemars Piguet pocket watch from the ‘20s, for a record-breaking price at Sotheby’s.

Diamond ring in parts
Lab-GrownDec 18, 2025
Kira Jewels Debuts Custom Lab-Grown Diamond Jewelry Service

The lab-grown diamond grower now offers custom engagement and fashion jewelry through its Kira Custom Lab Jewelry service.

roseco-catalog.png
Brought to you by
Roseco Releases New Full-Line Catalog

Roseco’s 704-page catalog showcases new lab-grown diamonds, findings, tools & more—available in print or interactive digital editions.

Terry and Cindy Chandler at AGS Conclave
EditorsDec 18, 2025
Terry Chandler Looks Back on 40 Years of Opportunity, Change, and Friends

Chandler got his start at Michelson Jewelers and has served as DCA president and CEO since 2001. He will retire at the end of the month.

Rendering of Bob’s Watches JFK airport store
WatchesDec 18, 2025
Bob’s Watches to Open Store in New York’s JFK Airport

The boutique is slated to open this week inside Terminal 8, offering pre-owned Rolex watches and more to international travelers.

JamAlert 1872x1052.png
Supplier BulletinDec 18, 2025
Cell Jammers Are Targeting Your Business. Here's How to Beat Them

Sponsored by Digital Monitoring Products

Ashley Zhang Jewelry Snake Necklace, Renato Cipullo Hematite Blaze Necklace, Vanessa Fernandez Studio Curva Wrap Hoops, Hernsdorf Tears of Aphrodite Necklace, Robinson Pelham Tsar Star Earrings, Marla Aaron Nymphenburg Lock, Lof The Valentine Ring
EditorsDec 17, 2025
2025 Jewelry Rewind: The Best Piece of the Week Picks

Associate Editor Natalie Francisco plays favorites with Piece of the Week, selecting a standout piece of jewelry from each month of 2025.

Lucy Hale in Jacquie Aiche’s Love and Desire Campaign
CollectionsDec 17, 2025
Lucy Hale Stars in Jacquie Aiche’s Holiday Campaign

The “Love and Desire” campaign is inspired by the magic that follows when one’s heart leads the way, said the brand.

SSEF logo
GradingDec 17, 2025
SSEF Announces 2025 Scholarship Winners

Two awardees will receive free tuition for an educational course at the Swiss lab, with flights and lodging included.

Pandora Alexander Lacik and Berta de Pablos-Barbier
MajorsDec 16, 2025
Pandora’s New CEO Will Step Up Early

Berta de Pablos-Barbier will replace Alexander Lacik at the start of January, two months earlier than expected.

JAR pendant brooch, fancy intense blue diamond
AuctionsDec 16, 2025
Suzanne Belperron, JAR Shine in Sotheby’s First Auctions at New HQ

Sotheby’s held its first two jewelry sales at the Breuer building last week, and they totaled nearly $44 million.

The Jewelry Symposium logo
Events & AwardsDec 16, 2025
TJS Now Accepting Scholarship Applications for 2026

Winners will receive free registration and lodging for its fourth annual event in Detroit.

National Jeweler columnists and PR professionals Duvall O’Steen and Jen Cullen Williams
ColumnistsDec 16, 2025
Beyond Unboxing: Creative Reveals to Drive Reach and Engagement

Here are six ideas for making more engaging content for Instagram Reels and TikTok, courtesy of Duvall O’Steen and Jen Cullen Williams.

Tiffany & Co. logo, Anna Martin, CD Peacock logo
Events & AwardsDec 16, 2025
Diamonds Do Good Names 2026 Award Recipients

The honorees include a notable jewelry brand, an industry veteran, and an independent retailer.

Eduard Stefanescu, left, and Sara Yood, right
Policies & IssuesDec 15, 2025
Sara Yood Named Co-Chair of RJC Standards Committee

Yood will serve alongside Eduard Stefanescu, the sustainability manager for C.Hafner, a precious metals refiner in Germany.

MS Rau Aspen rendering
IndependentsDec 15, 2025
M.S. Rau to Open Store in Aspen

The New Orleans jeweler is also hosting pop-up jewelry boutiques in New York City and Dallas.

Tiffany & Co. Paraíba tourmaline jewelry
AuctionsDec 12, 2025
13.54-Carat Paraíba Tourmaline Sets Records at Christie’s

Set in a Tiffany & Co. necklace, it sold for $4.2 million, the highest price and price per carat paid for a Paraíba tourmaline at auction.

David Webb holiday window
MajorsDec 12, 2025
David Webb Reveals Ice-Cold Holiday Window Display

The jeweler’s “Deep Freeze” display showcases its iconic jewelry designs frozen in a vintage icebox.

Oscar Heyman Yellow Green Sphene and Diamond Ring
CollectionsDec 12, 2025
Piece of the Week: Oscar Heyman’s Sphene Ring

Take luxury gifting to new heights this holiday season with the jeweler’s showstopping 12-carat sphene ring.

IGI Design Contest Graphic
Events & AwardsDec 12, 2025
IGI Jewelry Design Contest Now Accepting Submissions

This year's theme is “Unveiling the Depths of the Ocean.”

Jacquie Aiche Alien Heart Eye Inlay Necklace, Cicada Dragonfly Brooch, Harkness After the Rain Earrings
TrendsDec 11, 2025
Pinterest 2026 Trend Report: Brooches, Bold Gold, Cool Blue

In its annual report, Pinterest noted an increase in searches for brooches, heirloom jewelry, and ‘80s luxury.

GIA new colored stone report
GradingDec 11, 2025
GIA to Offer Origin Determination for 3 More Gemstones

Starting Jan. 1, customers can request the service for opal, peridot, and demantoid garnet.

×

This site uses cookies to give you the best online experience. By continuing to use & browse this site, we assume you agree to our Privacy Policy