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

Replica of Infinity Gauntlet
AuctionsNov 03, 2026
Infinity Gauntlet Set With 170+ Carats of Colored Gemstones Up for Auction

A replica of one of the most powerful objects in the Marvel Cinematic Universe, the glove is heading to auction next month in Abu Dhabi.

Arthur Klein
IndependentsNov 03, 2026
Longtime Jewelry Marketer Arthur Klein Dies at 89

Klein, who had his own marketing agency and worked for Gabriel & Co. and Trans American Diamond, is remembered as a kind man.

Zadok Jewelers
IndependentsNov 03, 2026
Zadok Jewelers Toasts To 50 Years With Diamond Bracelet Giveaway

To enter the giveaway, locals can purchase a featured beverage from one of eight participating restaurants in Houston and Austin, Texas.

overnight btyb 1026.png
Brought to you by
How Overnight Mountings’ Bridal Builder Makes Custom Engagement Ring Design Easier to Sell

With customization becoming more expected in engagement ring shopping, the Bridal Builder makes the process tangible.

David Yurman Gem Awards Grant 2027 Graphic
Events & AwardsNov 03, 2026
David Yurman Gem Awards Grant Opens 2027 Applications

The grant recipient will be awarded $50,000 as well as mentoring meetings with executives at David Yurman and other industry executives.

Weekly QuizOct 29, 2026
This Week’s Quiz
Test your jewelry news knowledge by answering these questions.
Take the Quiz
Kirstin Viland, Joanna Kovacs, Shari Lukacs
Events & AwardsNov 03, 2026
NAJA, Instappraise Name 2026 Scholarship Winners

The winners include a non-NAJA member seeking training, a member beginning NAJA courses, and a member becoming a Certified Master Appraiser.

Sothebys Romanov sapphire
AuctionsNov 02, 2026
197-Carat ‘Romanov Sapphire’ Heads to Sotheby’s Geneva

The rare jewel, which has links to Russia’s Romanov dynasty, is estimated to fetch up to $2 million.

DeBeersICONS_TITLE1_CUSTOMCONTENT_1872x1052 (1).jpg
Brought to you by
A Diamond Is Forever Launches 2026 Holiday Campaign Championing Natural Diamonds

A Diamond Is Forever's holiday campaign reimagines natural diamond icons for a new generation celebrating individuality.

Fake Audemars Piguet watch
CrimeNov 02, 2026
Customs Seizes More Than 400 Fake Audemars Piguet Watches

It is one of several seizures of counterfeit jewelry and watches by U.S. Customs and Border Protection officials in Louisville this year.

Jewelers of America new board members
MajorsNov 02, 2026
Lawrence Bock, Caryl Capeci, Amanda Coleman-Phelps Join JA Board

Jewelers of America announced the additions to its board of directors following its annual general meeting, held last week.

Kristi Yamaguchi Wearing Always Dream Collection
CollectionsNov 02, 2026
Olympian Kristi Yamaguchi, Heller Jewelers Expand ‘Always Dream’ Collection

The jewelry collection supports Yamaguchi’s Always Dream foundation, which provides reading and educational resources to families in need.

2026 AGTA Spectrum & Cutting Edge Awards Best Of Winners
Events & AwardsOct 30, 2026
Illuminating Carved Paraiba Pendant, Suite of Moonstones Wow at Spectrum Awards

Spectrum’s “Best of Show” honors went to a 101-carat Paraiba carved to look like Medusa that has a magnet-activated LED light.

Edina Kiss Eye Pendants on Charm Necklace
TrendsOct 30, 2026
Edina Kiss’ Pendants Say ‘Eye’m Watching You’

Our Halloween Pieces of the Week are four “Eye” pendants, each set with colorful gemstones.

Alexis Hoopes
MajorsOct 30, 2026
The RealReal Hires Former eBay Exec as New Chief Merchandising Officer

Alexis Hoopes expanded eBay’s “Authenticity Guarantee” program during her tenure.

Rolex store exterior Bellevue Washington
WatchesOct 29, 2026
Bucherer Opens Rolex Boutique in Washington State

The Rolex-owned retailer’s new 4,700-square-foot store’s façade honors the Pacific Northwest’s evergreen forests.

Norma Wellington spider web pendant
TrendsOct 29, 2026
Amanda's Style File: All Treats, No Tricks

Get into the Halloween spirit with this roundup of 13 spooky jewels.

Ann Cahoon
MajorsOct 29, 2026
Gesswein Hires Longtime Bench Jeweler, Educator Ann Cahoon

Cahoon was appointed strategic account and educational program manager at Gesswein, which recently joined Continental Buying Group.

Tiffany & Co. Love Is a Gift Holiday Campaign with Amanda Seyfried
MajorsOct 29, 2026
Amanda Seyfried Stars In Tiffany & Co.’s Holiday Campaign

Tiffany & Co.’s latest ambassador makes her debut in its “Love Is a Gift” holiday campaign.

Graphic of cauldron and cat with jewelry in bubbles
EditorsOct 28, 2026
These Wicked Jewels Will Cast a Spell on You

For her annual Halloween story, Senior Editor Lenore Fedow highlights bewitching jewels fit for a witch that go from day to unholy night.

Jaythan Gilder and Stolen Tiffany & Co. Earrings
CrimeOct 28, 2026
Man In Florida Who Swallowed Tiffany & Co. Earrings Convicted

Jaythan Gilder was found guilty of robbery and grand theft after stealing and then ingesting nearly $800,000 worth of Tiffany & Co. jewelry.

Gas station
SurveysOct 28, 2026
Consumer Confidence Up in October as Gas Prices Ease

Consumer confidence remains on the long-term downward trend that’s persisted over the past few years, said a Conference Board economist.

Stuller Magic of the Moment Holiday Campaign
MajorsOct 28, 2026
Stuller’s Holiday Campaign Lets the ‘Magic of the Moment’ Shine

The holiday campaign includes key jewelry trends, a curated holiday gift guide, and resources to help jewelers prepare for holiday shoppers.

De Beers Desert Diamonds Icons Campaign Designer Showcase
SourcingOct 27, 2026
De Beers Celebrates the Holidays With New ‘Desert Diamonds’ Campaign

The “Icons” holiday campaign spotlights four classic diamond jewelry styles reimagined in “Desert Diamond” tones.

Mervis Diamond Importers store
IndependentsOct 27, 2026
Solomon Brothers Acquires Mervis Diamond Importers

Solomon Brothers, which has three stores in the Metro Atlanta area, said it may continue to acquire other independent jewelers.

Woman holding testing swab
IndependentsOct 27, 2026
Gabriel & Co. Supports Charity Partner DKMS With Gala, New Jewels

The fine jewelry brand raised $2.3 million at its annual gala that supports the nonprofit’s fight against blood cancer and blood disorders.

Sarin Bachmann and Julie Walsh
Events & AwardsOct 27, 2026
JFC Announces 2027 ‘Facets’ Honorees

The annual fundraising event is slated for June 6, 2027, at The Venetian Resort in Las Vegas.

Ali Ahn in Bliss Lau Vantage Collection Campaign
CollectionsOct 26, 2026
Bliss Lau’s ‘Vantage’ Point Is the Hawaiian Horizon

In her “Vantage” collection, Lau explores heritage, identity, and inner strength through designs featuring blue-green Guatemalan jade.

×

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