Lab-Grown

NYC Diamond Dealer Accused of Lab-Grown Diamond Swaps

Lab-GrownJul 31, 2024

NYC Diamond Dealer Accused of Lab-Grown Diamond Swaps

Manashe Sezanayev faces felony charges of fraud and grand larceny for allegedly replacing three natural diamonds with lab-grown ones.

Stock image of loose polished diamonds
Manashe “Mike” Sezanayev, who operates a diamond business on 47th Street in New York City’s Diamond District, is accused of stealing $460,000 worth of natural diamonds by swapping them out for significantly less valuable lab-grown stones.
New York—A 47th Street diamond dealer faces charges of larceny and fraud for allegedly swapping out natural diamonds for lab-grown ones, the Manhattan District Attorney’s office announced late last week.

Manhattan DA Alvin Bragg Jr. said 41-year-old Manashe Sezanayev of Queens, New York, was indicted in New York State Supreme Court on two counts of second-degree grand larceny, one count of first-degree scheme to defraud—both felonies—as well as three counts of third-degree criminal possession of a forged instrument, a misdemeanor. 

Sezanayev, better known as “Mike,” operates Rachel’s Diamonds (a.k.a. Rachel’s Lab Grown Diamonds) on Manhattan’s 47th Street. 

According to court documents and statements made on the record in court, on Feb. 5, a diamond merchant came to Sezanayev’s office with two natural diamonds Sezanayev claimed to be interested in buying. 

The stones were valued at approximately $185,000 and $75,000. 

When Sezanayev turned his back to the dealer to weigh the stones on the scale, he allegedly swapped them out for two lab-grown diamonds that had been recut to mimic the natural diamonds’ weight and quality. 

The lab-grown diamonds, which are worth significantly less than their natural counterparts, also had been fraudulently inscribed with report numbers for natural diamonds graded by the Gemological Institute of America.

Sezanayev allegedly pulled off another switch the following month, according to court records.

On March 27, Sezanayev told another diamond merchant that he had a customer interested in purchasing a diamond valued at about $200,000. 

Sezanayev then allegedly purchased a lab-grown diamond that was recut to mimic the $200,000 natural diamond and inscribed with a fraudulent GIA report number. 

The following week, on April 2, the merchant met with Sezanayev and his purported customer and Sezanayev examined the diamond. 

It was only later that the merchant learned that the diamond Sezanayev returned to him was a lab- grown stone, according to court records.

Sezanayev has pleaded not guilty in the case and his attorney, Queens-based Boris Nektalov, told National Jeweler on Tuesday that his client is “awaiting his day in court.” 

 Related stories will be right here … 

In the press release announcing Sezanayev’s indictment, the Manhattan DA’s office thanked both the New York Police Department and GIA for aiding in the investigation.

A GIA spokesman said Tuesday, “We are grateful that we were able to assist the Manhattan District Attorney’s office with the investigation … For many years, GIA has provided training and investigation assistance to law enforcement in the U.S. and around the world. This is part of our mission to protect consumers and our work to meet the industry’s needs.”

He also noted that in addition to the GIA iD100, the lab’s desktop diamond tester, the lab offers four services to match a loose diamond to its GIA report.

They are: GIA Report Check; GIA Report Confirmation Service, which became available at all GIA labs earlier this year; GIA Match iD, an inscription viewing instrument that uses AI; and the lab’s Update Service, in which GIA-graded diamonds can be submitted for re-evaluation. 

The recent indictment in New York State Supreme Court is not the first time Sezanayev has been accused of 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. 

Michelle Graffis the editor-in-chief at National Jeweler, directing the publication’s coverage both online and in print.
tags:

The Latest

Graphic for Episode 8 of the My Next Question podcast
PodcastsAug 19, 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.

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.

Spinelli Kilcollin Trade-In Bar Program Imagery
Policies & IssuesAug 19, 2026
Spinelli Kilcollin Embraces Dupes With Trade-In Program

The jeweler is encouraging customers who own lookalike rings to come into the store and trade them for credit towards an authentic piece.

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.

Woman wearing Zales jewelry
MajorsAug 19, 2026
Zales Wants You to Wear Fine Jewelry Every Day

The new campaign, “You Are The Occasion,” discourages shoppers from saving their fine jewelry for special occasions only.

Weekly QuizAug 13, 2026
This Week’s Quiz
Test your jewelry news knowledge by answering these questions.
Take the Quiz
Former GJEPC Chairman and second-generation Indian diamantaire Vasant Mehta
SourcingAug 19, 2026
Vasant Mehta, a Dedicated Diamond Industry Leader, Dies at 81

Mehta led India’s GJEPC through the 2008 financial crisis and was respected worldwide for his wisdom, integrity, and knowledge.

Alfredo Colmenero-Martinez and Jarren Frazier
CrimeAug 18, 2026
2 California Men Arrested in Fatal Vehicle Smash Robbery

One is the driver who allegedly crashed a car into a Sacramento jewelry store in April, striking a 71-year-old employee who later died.

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.

The Retail Smiths Principal Partner and National Jeweler columnist Peter Smith
ColumnistsAug 18, 2026
Peter Smith: The IKEA Effect and Bridal Branding

In a new column, Peter Smith posits that people actually enjoy putting together IKEA furniture, and the same is true for engagement rings.

Police car with lights on
CrimeAug 18, 2026
Thieves Snatch $1M in Jewelry From New Jersey Jeweler

9lakha Jewelers in Iselin, New Jersey, was the target of a smash-and-grab robbery on Aug. 8.

Louis Comfort Tiffany Poppy lampshade drawing
Events & AwardsAug 17, 2026
Exhibition on Louis Comfort Tiffany’s Studios to Open at The Met

The exhibition will feature more than 100 drawings of stained-glass lampshades, windows, and more, many created by women and émigrés.

Spinelli Kilcollin Inara Ring
CollectionsAug 17, 2026
Marquise Diamonds Dance in Spinelli Kilcollin’s ‘Wren’ Collection

Marquise-cut diamonds in drop charms are the center of the new collection, reflecting the movement of a dancer in modular styles.

Ft. Lauderdale Jewelry, Antique, & Object Show logo
Events & AwardsAug 17, 2026
There’s a New Jewelry Show Coming to Florida

The inaugural Fort Lauderdale Jewelry, Antique, & Object Show will be held from Jan. 28 through Feb. 1, 2027.

Karl Getschel and Bob Yanega of Smyth Jewelers
IndependentsAug 14, 2026
Smyth Jewelers to Open Fourth Location

The family-owned jeweler will open a new showroom in Bel Air, Maryland, this fall.

Stock image of a gavel
CrimeAug 14, 2026
Wife of Man Convicted in Jeweler’s Murder Sentenced for Conspiracy

Amanda Ileana Hernandez is married to Carlos Hernandez, one of two men in prison for the 2024 murder of Michigan jeweler Hussein Murray.

Paul Morelli Wavey Vine Earrings
TrendsAug 14, 2026
Paul Morelli’s Latest ‘Wavey Vine’ Earrings Embrace Color

The reimagined jewel, our Piece of the Week, trades the diamonds in the original 1998 design for blue, pink, yellow, and green sapphires.

Cover.jpg
Supplier BulletinAug 13, 2026
Your Piece Could Be the One Editors Talk About

Sponsored by American Gem Trade Association

Two Pandora Talisman pendants
FinancialsAug 13, 2026
Pandora’s ‘Talisman’ Collection Shines, Lab-Grown Diamond Sales Fall

In the United States, second-quarter sales were flat amid soft consumer sentiment and lower in-store traffic.

Cuckoo Cuckoo Cadbury Conundrum egg
AuctionsAug 13, 2026
This Gold Cadbury ‘Conundrum’ Egg Set a World Auction Record

The 22-karat gold egg, sold at Batemans Auctioneers in the U.K., was part of a 1980s treasure hunt ad campaign for Cadbury Creme Eggs.

Picture of 2,488 carat rough diamond next to tweezers, a golf ball, and a loupe
SourcingAug 13, 2026
2,488-Carat Diamond, Largest Found in Botswana, Has a New Owner

Lucara Diamond Corp., which recovered the “Motswedi” diamond from the Karowe mine, sold the stone for an undisclosed amount.

John Hardy Heishi Collection Campaign Imagery
CollectionsAug 13, 2026
John Hardy Infuses ‘Icon,’ ‘Heishi’ Collections with Color

The expanded collections now feature hand-cut gemstones like topaz, tanzanite, chrysoprase, chalcedony, smoky quartz, and fire opal.

Legacy emerald
SourcingAug 12, 2026
Eshed-Gemstar on the Painstaking Process of Cutting ‘The Legacy Emerald’

The gemstone supplier and manufacturer acquired the remarkable 104-gram Zambian emerald at Gemfields’ auction in May.

Surveillance image of jewelry thieves
CrimeAug 12, 2026
Elderly NYC Woman Targeted in Jewelry Swap Scheme

Two suspects offered to trade the woman a “winning” lottery ticket for her jewelry.

The Finsch Diamond Mine in South Africa, owned by Petra Diamonds Ltd.
SourcingAug 12, 2026
Another Diamond Mine Poised to Close

Finsch has been in business rescue since May, and owner Petra Diamonds said it sees no viable path forward for the mine.

Stock image of gavel, handcuffs, and law books
CrimeAug 12, 2026
Jewelry Store Employee Gets 20 Years to Life in Choking Death of Boss

Michel Patrick DeSalles was sentenced after pleading guilty to the 2017 murder of Omid Gholian, who owned a jewelry store in Manhattan.

Beth Miller Frederick Goldman
MajorsAug 12, 2026
Frederick Goldman Names New SVP of Sales

Longtime industry executive Beth Miller has taken on the role.

Verdura unicorn brooch
AuctionsAug 11, 2026
Verdura Unicorn Brooch With Royal Connection Up for Auction

The brooch was owned by Virginia Fortune Ryan Ogilvy, who served as a lady of the bedchamber to Queen Elizabeth II for nearly 50 years.

×

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