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

National Jeweler columnist and Smart Age founder and CEO Emmanuel Raheb
ColumnistsMar 31, 2026
Q1 Clues That Reveal Where Your Jewelry Store’s Sales Are Heading

These customer behavior patterns say a lot about how successful your jewelry store is going to be this year, Emmanuel Raheb writes.

Mejuri Puzzle Collection Campaign Imagery
CollectionsMar 31, 2026
Mejuri Adds Silver to ‘Puzzle’ Collection

Mejuri’s popular collection of 18-karat yellow gold vermeil rings debuted in sterling silver alongside new “Puzzle” slider charms.

Ashley Longshore in Buddha Mama jewelry
CollectionsMar 31, 2026
Buddha Mama, Ashley Longshore to Host Pop-Up in Dallas

The Miami-based jewelry brand and the NYC-based artist will be in Dallas from April 9-11.

GIA iD100®
Brought to you by
Protect Your Customers and Your Business

You deserve to know what you are selling–to protect your customers as well as your business and your reputation.

Natural Diamond Council world diamond day
SourcingMar 31, 2026
NDC Designates April 8 as 'World Diamond Day'

The initiative invites those in the industry to share stories on social media highlighting the meaning and impact of natural diamonds.

Weekly QuizMar 26, 2026
This Week’s Quiz
Test your jewelry news knowledge by answering these questions.
Take the Quiz
Jillian Wolk, the new CEO of Tracr
SourcingMar 31, 2026
GIA VP Jillian Wolk to Take Over at Tracr

Wolk’s first day on the job as CEO of Tracr, De Beers Group’s blockchain platform, will be May 1.

Tom Moses examining the “Motswedi” diamond
EditorsMar 30, 2026
Tom Moses Looks Back on His Decades at GIA

Moses, who will leave the lab in May after nearly 50 years, discusses his start in the business, gemstones that stand out, and what’s next.

TopImageCrop.jpg
Brought to you by
Is This You? Every Jeweler Has This Problem; We Have the Solution.

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

Oscar Heyman Spring Catalog Aquamarine and Diamond Necklace and Platinum Opal, Sapphire, Emerald, Diamond Bracelet
TrendsMar 30, 2026
Oscar Heyman Debuts First Spring Catalog

The new catalog, which showcases 35 one-of-a-kind pieces of jewelry, is a compliment to the company’s popular holiday catalog.

Diavik Diamond Mine winter aerial shot
SourcingMar 30, 2026
Rio Tinto Hauls Last Load from Diavik

Production has ceased at the Canadian diamond mine, which has yielded more than 150 million carats of rough diamonds in its 23-year run.

Tanishq Westborough Massachusetts store
MajorsMar 30, 2026
Tanishq Opens First New England Location

The store opening marks the 10th United States location for the India-based jewelry retailer.

Saks Fifth Avenue door sign
MajorsMar 27, 2026
Saks Global Has Changed Its Mind About Closing These 3 Stores

Two Saks Fifth Avenue locations, one in Florida and one in California, and one Neiman Marcus store are off the chopping block.

Jimmy West celebrating 40 years with Leading Jewelers Guild
IndependentsMar 27, 2026
Jimmy West, Longtime LJG Executive Director, Dies at 72

West, who started in the art department at the Leading Jewelers Guild in 1979, is remembered for his patience, kindness, and dedication.

Itä Yari Whirl Ring Tesoro
CollectionsMar 27, 2026
Itä’s ‘Yarí Whirl’ Ring Tells Every Side of the Story

In the “Tesoro” version of the ring, our Piece of the Week, each side of the gold hexagonal nugget has a unique colored gemstone design.

Citizen Watch America President Jeffrey Cohen
WatchesMar 26, 2026
Q&A: Citizen Watch America President Jeffrey Cohen on Eco-Drive’s 50th Anniversary

Cohen discusses the evolution of Citizen’s light-powered technology, the brand’s cross-generational appeal, and tariffs.

Peter Smith Essentially Human: On Sales and Salespeople
IndependentsMar 26, 2026
Peter Smith Pens Book on Human Behavior in Sales

“Essentially Human: On Sales and Salespeople" reveals the underlying human traits and behaviors of the most successful sales professionals.

Lionheart Cassandane Collection Campaign
CollectionsMar 26, 2026
Lionheart Celebrates 13 Years of ‘Cassandane’

The collection features symbols of love, luck, and light, based on the story of Queen Cassandane and Cyrus the Great of Persia.

Instappraise NAJA
Events & AwardsMar 26, 2026
NAJA, Instappraise Introduce New Scholarship

It’s the third scholarship to be launched as part of the partnership to help appraisers advance their professional credentials.

CASE Awards Graphic
Events & AwardsMar 26, 2026
JA Still Accepting Entries for 2026 CASE Awards

The deadline for entries in the jewelry design competition has been extended to April 3.

Industry journalist Rob Bates
SourcingMar 25, 2026
Rob Bates Steps Down as JCK News Director

After 28 years with JCK, the veteran industry journalist is launching his own publication on Substack called The Jewelry Wire.

AMNH Beryl
GradingMar 25, 2026
New York’s Natural History Museum, Wiley To Build Minerals Database

Wiley said the project will give scientists worldwide access to the American Museum of Natural’s History renowned mineral collection.

Boochier Flower Puff Campaign
CollectionsMar 25, 2026
Boochier Turns Flower Friendship Bracelets Into Fine Jewelry

The “Flower Puff” collection looks to beaded flower friendship bracelets from childhood, turning the silhouette into nostalgic fine jewelry.

Community for Ethical Jewelry logo
Policies & IssuesMar 25, 2026
Community for Ethical Jewelry to Host Bench Jeweler Shortage Webinar

Set for April 2, the webinar will discuss how the jewelry industry can address the workforce gap.

Lisa Bayer
IndependentsMar 24, 2026
Lisa Bayer, Illustrator and Beloved Member of the Muse Family, Dies at 64

Bayer, founder of Lisa Bayer Designs, is remembered as “a bright light in every room.”

Tiffany & co diamond ring
AuctionsMar 24, 2026
White Diamonds Shine In Christie's Jewels Online Sale

The highest-grossing lot was a Tiffany & Co. ring set with a flawless, emerald-cut diamond of 10 carats.

AGTA GemFair Tucson
SourcingMar 24, 2026
AGTA Solidifies Tucson Dates For 2027-2029

The next three editions of AGTA GemFair Tucson will feature a five-day show that includes Sunday.

Tom Heap
WatchesMar 24, 2026
Christie’s Names New Senior Specialist, Watches

Former Sotheby’s executive Tom Heap has taken on the London-based role.

×

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