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

Simon G CEO Zaven Ghanimian
EditorsSep 03, 2026
Q&A: Simon G.’s CEO on Why He Won’t Use AI for Jewelry Design

Zaven Ghanimian discussed the value of human craftsmanship and where the implementation of artificial intelligence does work.

Jewelers of America logo
Events & AwardsSep 03, 2026
Here Are the First Recipients of Nina Pugliese Memorial Scholarship

Jewelers of America also revealed the recipients of the Seymour & Evelyn Holtzman Bench Scholarship and its own scholarship programs.

Robert Pattinson Jaeger-LeCoultre
WatchesSep 03, 2026
Robert Pattinson Joins Jaeger-LeCoultre as Brand Ambassador

The British actor, known for his roles in “Twilight” and “The Odyssey,” will star in a campaign for the Master Control Chronometre.

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.

Sydney Evan Little Love Open Coin Fixed Necklace
CollectionsSep 03, 2026
Sydney Evan Celebrates 25 Years With 4 New Collections

The “Confetti Disco,” “Champagne Cheers,” “Tuxedo,” and “Classic Punk” jewelry collections each capture a distinct spirit of celebration.

Weekly QuizSep 03, 2026
This Week’s Quiz
Test your jewelry news knowledge by answering these questions.
Take the Quiz
Sandy Lerner’s 18-karat gold and diamond cat brooch
AuctionsSep 02, 2026
If You Love Cats, This Jewelry Auction Is for You

Cat ladies of the jewelry world, unite. Sandy Lerner’s “significant” collection of cat jewelry and other objects is going up for auction.

Arnaud Michon
MajorsSep 02, 2026
Messika Names Former Omega Exec as New President, CEO of Americas

Arnaud Michon, the former Omega USA President, will now lead Messika’s Americas region during its international development.

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.

Glitter in the Grove Logo
Events & AwardsSep 02, 2026
Emerald’s New Owner Introduces ‘Glitter in the Grove’

The branding references the back-to-back jewelry shows that new parent company Forge will host in Miami's Coconut Grove this November.

Stainless steel Patek Philippe Calatrava watch
AuctionsSep 01, 2026
UK Woman Uncovers Rare Patek Philippe Watch in Mom’s Jewelry Box

The stainless steel Patek Philippe “Calatrava” watch from the 1930s sold for nearly $80,000 at a recent Hansons Cornwall auction.

Smart Age Solutions founder and CEO Emmanuel Raheb
ColumnistsSep 01, 2026
Your Jewelry Marketing Has a Bridal Problem

Engagement rings are important but don’t ignore the customers who are buying jewelry “just because,” Emmanuel Raheb writes.

Charlotte Fournet and Krizia Cucurachi
MajorsSep 01, 2026
Kering Names New Pomellato, DoDo CEOs

Former Pomellato CEO Sabina Belli has been named president of Kering Italia amid a shakeup of Kering's new Jewelry division.

Anne Marie Shulman
MajorsSep 01, 2026
Anne Marie Shulman Joins GPA Global

The veteran luxury packaging executive was appointed to help the company grow its North American business.

Ethiopian paraiba tourmaline
GradingAug 31, 2026
GIA, Gübelin Gem Lab Confirm New Paraíba Tourmaline Deposit in Ethiopia

The labs’ separate investigations each determined that the East African country is producing copper-bearing tourmaline.

Levinger & Bissenger silver floral pendant
Events & AwardsAug 31, 2026
Wisconsin Museum to Host Jewelry Exhibition

“Chicago Collects: Jewelry in Perspective” at the Oshkosh Public Museum will feature works by Fabergé, Lalique, and Louis Comfort Tiffany.

Catbird First Men’s Collection Worn Well
CollectionsAug 31, 2026
Catbird Launches First Men’s Jewelry Collection

The “Worn Well” collection is Catbird's take on classic men's jewelry.

Buddha Mama Butterfly Necklace
CollectionsAug 28, 2026
Dolly Parton Would Have Loved This Butterfly Necklace

This Buddha Mama butterfly is our Piece of the Week honoring the legend, who embraced the beautiful insect as her symbol.

Gareth Penny
SourcingAug 28, 2026
Gareth Penny to Give Opening Speech at CIBJO Centenary Congress

The former De Beers CEO, and perhaps its next owner, will be a featured speaker at the event, slated for Sept. 4-7 in Italy.

Day’s Jewelers store in Salem New Hampshire
IndependentsAug 28, 2026
Day’s Jewelers Honored With 3 Workplace Awards

The employee-owned jeweler was named a “Best Place to Work” in Maine, New Hampshire, and for women.

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.

Counterfeit Cartier Love bracelet
CrimeAug 27, 2026
Customs Seizes Nearly 900 Pieces of Counterfeit Jewelry

The package, intercepted in Indianapolis, contained fake Cartier, Tiffany & Co., and Van Cleef and Arpels jewelry.

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.

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.

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.”

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.

×

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