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

Alex Consani in Pandora Talisman campaign
CollectionsAug 27, 2026
Pandora Expands ‘Talisman’ Collection as Lawsuit Continues

The second iteration of the jewelry collection was inspired by the zodiac and the four elements: earth, water, air and fire.

Stock image of loose polished diamonds
SourcingAug 27, 2026
OFAC Renews License Allowing Import of ‘Grandfathered’ Russian Diamonds

General License 104B supersedes General License 104A, which was set to expire on Sept. 1.

Jessica McCormack South Coast Plaza California Store Exterior
IndependentsAug 27, 2026
Jessica McCormack to Open First West Coast Store

The new location in Costa Mesa, California, marks the brand’s second store in the United States and fourth standalone location worldwide.

Cover.jpg
Brought to you by
Your Piece Could Be the One Editors Talk About

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

Kate Spade Movado watches
FinancialsAug 27, 2026
Movado’s Q2 Sales Up As Younger Consumers Take Interest in Watches

The fashion watch category was once threatened by the Apple Watch, but consumers are now opting for new wearables, said Movado’s CEO.

Weekly QuizAug 27, 2026
This Week’s Quiz
Test your jewelry news knowledge by answering these questions.
Take the Quiz
Retrouvaí flying pig signet ring
SurveysAug 26, 2026
5 Jewelry Insights From The RealReal’s Resale Report

The report delves into trending styles, the most popular jewelry brands by city, and why Belle Époque jewelry could be the next big thing.

AGTA 17th edition gemstone information manual
Lab-GrownAug 26, 2026
AGTA Now Requiring Members to Call Lab-Grown Gems ‘Synthetic’

The association added the requirement to its revised "Code of Ethics" and released the 17th edition of its “Gemstone Information Manual.”

1872-x-1052-July-ad (1).png
Brought to you by
Why More Jewelry Retailers Are Hosting Turnkey Estate Buying Events

Retailers are seeking new ways to attract customers, increase traffic, and create revenue – Estate buying events are a popular solution.

Hand pushing a shopping cart
SurveysAug 26, 2026
Consumer Confidence Dips in August Amid Anticipatory Anxieties

Respondents were concerned about the future of the labor market and their income as well as the rising prices of gas and groceries.

Boucheron Goutte Eternity Question Mark
TrendsAug 26, 2026
Boucheron’s New Campaign Celebrates Its ‘Question Mark’ Necklaces

The campaign highlights the asymmetrical high jewelry necklace style that the jeweler first created in 1879.

Harry Winston Rare Jewels of the World
Events & AwardsAug 26, 2026
Harry Winston Exhibition to Open in Shanghai

It will explore the life of “The King of Diamonds” and showcase more than 165 creations from the brand.

Technology Therapy Group Founder and CEO Jennifer Shaheen
ColumnistsAug 25, 2026
Proof Before Purchase: The Gen Z Way to Buy

In her first column for National Jeweler, Jennifer Shaheen asks jewelers if they know how to connect with the next generation of consumers.

SSEF logo
Events & AwardsAug 25, 2026
SSEF Opens 2026 Applications for Gemology Education Scholarships

The annual awards cover tuition for an on-site educational course at the Swiss lab, as well as flights and lodging.

Brent Neale x Blackberry Farm Blackberry Pendants
TrendsAug 25, 2026
Brent Neale Celebrates Blackberry Farm’s Anniversary With Jewelry

The jeweler partnered with the Tennessee resort to honor its 50th anniversary with limited-edition blackberry pendants and earrings.

Genna Zimmer Reeds Jewelers
EditorsAug 24, 2026
Q&A: Reeds Jewelers VP Genna Zimmer on 80 Years in Business

The third-generation jeweler shared how the North Carolina retailer is celebrating this milestone and the love story that started it all.

Rio Grande Metalwerx Argentium Silver leaves
Events & AwardsAug 24, 2026
Rio Grande, MetalWerx Host Argentium Silver Workshop

The class, led by renowned metalsmith Cynthia Eid, highlighted Argentium silver as an alternative to gold amid high prices.

Jewelry at JIS Miami
Events & AwardsAug 24, 2026
JIS Miami Opens Fall 2026 Registration

The show is slated for Oct. 16-19 at the Miami Beach Convention Center.

Francesca Villa Empress Joséphine Necklace
CollectionsAug 24, 2026
Francesca Villa Honors Napoleon, His Empresses In New Capsule

The “Empresses” capsule uses 19th-century medals depicting Napoleon, Joséphine, and Marie-Louise across five one-of-a-kind pieces.

Interior of Dick’s Sporting Goods store
SurveysAug 21, 2026
These Are 2026’s Hottest Retailers, Says NRF

The retailers at the top of the list offer affordable products and fun, discovery-fueled experiences.

Daniel Bing
WatchesAug 21, 2026
Bremont Names Former Vacheron Constantin Exec CMO

Daniel Bing was formerly the marketing director for the Americas at Vacheron Constantin.

Bijules x Kamyen Topspin Tennis Bracelet in Grass Green
CollectionsAug 21, 2026
Bijules, Kamyen Serve Up ‘Topspin’ Tennis Bracelet Ahead of US Open

In our Piece of the Week, the designers reimagine the tennis bracelet with green enamel wrapped around a strand of “Desert Diamonds.”

Graphic for Episode 8 of the My Next Question podcast
PodcastsAug 20, 2026
Episode 8: Diamond Industry Update With David Bonaparte & Ronnie VanderLinden

The industry veterans join the podcast to discuss diamond marketing, the FTC Jewelry Guides, and lobbying for lower tariffs.

Gemstone AI app screenshots
TechnologyAug 20, 2026
A New AI-Powered Gemstone Identification App Is Here

Founder Vik Westermann said the app is a “starting point” to inspire people to work with appraisers and gem labs, not replace them.

Verdura unicorn brooch
AuctionsAug 20, 2026
Storied Unicorn Brooch Up for Auction Gallops to New Home

The Verdura brooch, which belonged to the late Virginia Fortune Ryan Ogilvy, was sold to a private collector in Asia.

Lianna Carter, Lauren Edwards, Thomas Koslowski, Erin Perry, Heran Wang
Events & AwardsAug 20, 2026
MJSA Education Foundation Names 5 Scholarship Winners

The five students were awarded a total of $10,000 through the nonprofit’s 2026 “Future of Jewelry Making” scholarship.

The Plumb Club 2026-2027 Executive Committee and Board Members
MajorsAug 20, 2026
Plumb Club Elects 2026-2027 Board

Steven Lerche is now beginning his term as the youngest member to become president of The Plumb Club’s elected executive committee.

Mike Alexander and Scott Murphy
MajorsAug 19, 2026
Mike Alexander To Succeed Scott Murphy as Jewelers Mutual CEO

Murphy will retire at the end of the year and Alexander, currently the company’s president, will take over at the start of 2027.

×

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