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

The Retail Smiths partner and National Jeweler columnist Peter Smith
ColumnistsApr 30, 2026
Peter Smith: A Sleazy Salesman and the Case for Regret Avoidance

Smith uses a comment he overheard in the grocery store to remind retailers that their job is to inspire buying behavior, not just sell.

Claire’s new summer campaign
MajorsApr 30, 2026
Claire’s New Summer Campaign Is a Sensory Wonderland for Gen Alpha

“A Girl SMR at Claire’s” celebrates girlhood through the five senses with stacked jewelry, slime toys, scented accessories, and ASMR.

Cartier London Crash Watch
AuctionsApr 30, 2026
Vintage Cartier Watch Crashes Through Records, Selling for $2M

Believed to be one of three made in 1987, the Cartier London Crash was hot at the “Shapes of Cartier” sale at Sotheby’s Hong Kong.

Antique Jewelry & Watch Show
Brought to you by
Discover Timeless Treasures: A Showcase of Antique Jewelry & Timepieces in Las Vegas

Gain access to the most exclusive and coveted antique pieces from trusted dealers during Las Vegas Jewelry Week.

OAR26_NJ_bulletin_1872x1052_01.jpg
Supplier BulletinApr 30, 2026
OROAREZZO 2026: The B2B Event for Italian Excellence in Goldsmith, Jewelry and Silver Manufacturing

Sponsored by OROAREZZO International Jewelry Exhibition

Weekly QuizApr 30, 2026
This Week’s Quiz
Test your jewelry news knowledge by answering these questions.
Take the Quiz
Tiffany & Co. Mother’s Day email opt out
MajorsApr 29, 2026
The Thought Process Behind the Mother's Day Email Opt-Out

Some retailers are taking a nuanced approach to marketing what can be a difficult holiday for many.

Dick Abbott
IndependentsApr 29, 2026
Dick Abbott to Retire From The Edge

The Edge has announced its new CEO, as well as a new partnership with an investment firm focused on founder-led software businesses.

lvajws image 1.jpg
Brought to you by
Las Vegas Antique Jewelry & Watch Show: Showcasing the Most Collectible Merchandise from Across the Globe

Gain access to the most exclusive and coveted antique pieces from trusted dealers during Las Vegas Jewelry Week.

The Venetia Diamond Mine in South Africa
SourcingApr 29, 2026
De Beers’ Production Rises, Market Remains ‘Challenged’

De Beers’ diamond production was up 17 percent in Q1, boosted by increased output at its mines in South Africa and Canada.

John Wayne Signet Ring
AuctionsApr 29, 2026
This'll Be the Day You Own John Wayne's Ring

A signet ring belonging to the Western film star of Hollywood’s Golden Age will be up for auction at Elmwood’s next month.

Stock image of money
Policies & IssuesApr 28, 2026
Tariff Refunds: How to File, What to Expect

Importers can submit claims now to receive money back for the IEEPA tariffs they’ve paid, with refunds expected to take up to 90 days.

Gregory's Jewelers storefront
IndependentsApr 28, 2026
This North Carolina Jeweler Is Passing the Torch

The owners of Gregory Jewelers in Morganton, North Carolina, are heading into retirement.

Doug Hucker
SourcingApr 28, 2026
Doug Hucker Retires From ICA

The colored gemstone industry leader is heading into retirement after four years as the association’s CEO.

Natural Diamond Council Chief Marketing Officer Susie Dewey
SourcingApr 28, 2026
NDC Hires Tapestry Exec to Head Global Marketing

Susie Dewey joins the Natural Diamond Council as its new chief marketing officer.

The Ocean Dream diamond
AuctionsApr 27, 2026
12 Years Later, the ‘Ocean Dream’ Diamond Resurfaces at Christie’s

The largest known fancy vivid blue-green diamond could fetch more than $12 million at its second auction appearance.

Smart Age Solutions CEO and National Jeweler columnist Emmanuel Raheb
ColumnistsApr 27, 2026
Stop Treating Mother’s Day Like an Afterthought

Emmanuel Raheb says jewelers need to start marketing early and make it easy for customers to pick a gift for mom.

Longnecker Jewelry storefront
IndependentsApr 27, 2026
Longnecker Jewelry Celebrates 30 Years

In honor of the milestone, the Nebraska jeweler has debuted Leslie & Co., its new in-house jewelry brand.

Jeff Corey
MajorsApr 27, 2026
JBT Re-Elects Jeff Corey as Board Chair

The trade organization, which held its annual elections earlier this year, also added five new board members.

Fourteen August Irene mom ring
SurveysApr 24, 2026
Mother’s Day 2026 Jewelry Spending to Top $7B, NRF Says

NRF’s annual survey found that 45 percent of consumers plan to purchase jewelry for a loved one this Mother’s Day.

TwentyFour Vault Locket
TechnologyApr 24, 2026
TwentyFour’s Digital-Age Locket Is a Virtual Vault

The “Vault” charm, our Piece of the Week, expands on the memories that can be stored in a locket by connecting to your phone.

Hamptons Jewelry Show exhibitors Maison Mèrenor, Jochen Leën, Studio Javo
Events & AwardsApr 24, 2026
Hamptons Jewelry Show to Return in July

The open-to-the-public luxury jewelry and timepiece show, in its second year, is slated for July 23-26.

Photos from Day’s Jewelers 2025 Mother’s Day campaign
IndependentsApr 23, 2026
Meet the Real Moms of Day’s Jewelers

The jeweler’s Mother’s Day campaign highlights the women who work there—mothers, grandmothers, women who want to be mothers, and dog moms.

National Jeweler - Supplier Bulletin - April 2026 - JMSS Graphic.jpg
Supplier BulletinApr 23, 2026
JM® Shipping Solution: Smarter Shipping for High-Value Goods

Sponsored by Jewelers Mutual

Woman wearing Charles & Colvard lab grown diamond jewelry
Lab-GrownApr 23, 2026
Charles & Colvard May Sell Assets for $1.5M

The proposed agreement follows the moissanite maker’s Chapter 11 bankruptcy protection filing last month.

John Jacob Astor IV’s Titanic pocket watch and a gold pencil case
AuctionsApr 23, 2026
John Jacob Astor IV’s Titanic Pocket Watch Fetches $1M

The Patek Philippe for Tiffany & Co. timepiece Astor brought aboard the ill-fated ship sold for double its estimate at a Freeman’s auction.

Adam Neeley Dali Garden Collection Eyris Ring
CollectionsApr 23, 2026
Adam Neeley’s High Jewelry Collection Steps Into Salvador Dalí’s Garden

The “Dalí’s Garden” collection was inspired by a surreal dream Neeley had after cooking a recipe from Salvador Dalí’s 1973 cookbook.

Natalie Feanny
IndependentsApr 23, 2026
Windsor Jewelers Names New Buying Director

Natalie Feanny has been appointed to the 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