Lab-Grown

3 Moissanites With Fraudulent Inscriptions Submitted to GIA Lab

Lab-GrownJan 28, 2021

3 Moissanites With Fraudulent Inscriptions Submitted to GIA Lab

The stones were sent into the Johannesburg lab and researchers detailed their discovery in the fall issue of Gems & Gemology.

20210128_GIA_moissanite_fraudulent_inscription.jpg
At left, the fraudulent inscription seen on the lab-grown moissanite, with the GIA report number partially redacted for privacy; at right, GIA’s standard procedure in cases of fraudulent inscriptions is to make the number illegible. (Photo by Tuan Griezel, © GIA)
Johannesburg—Three stones submitted to the Gemological Institute of America’s lab in Johannesburg, South Africa turned out to be moissanites inscribed with GIA report numbers belonging to natural diamonds.

It is a first such discovery for the laboratory.

GIA reported on the finding in the fall 2020 issue of Gems & Gemology, in an article in the Lab Notes section authored by Sicebiso Hlatshwayo and Sally Eaton-Magaña. 

The note specifically addressed the first of the three stones received, a 1.02-carat round brilliant recently submitted for a Diamond Grading report. 

Standard testing showed the stone was not a diamond, and further tests proved it to be a synthetic (lab-grown) moissanite, Hlatshwayo and Eaton-Magaña wrote. 

They noted simulants are “often” submitted to the lab for diamond grading but are easily rooted out using the standard grading process. 

This is the first time, however, the lab has come across a fraudulent inscription on a diamond simulant, and the fake was apparent to graders for a number of reasons.


The 1.02-carat round brilliant lab-grown moissanite that was inscribed with the report number for a natural diamond of the same weight (Photo by Innocentia Nzuza, © GIA)
The 1.02-carat round brilliant lab-grown moissanite that was inscribed with the report number for a natural diamond of the same weight (Photo by Innocentia Nzuza, © GIA)


First, GIA checks all stones with a pre-existing inscription.

The report number on the 1.02-carat round brilliant moissanite belonged to an E-color natural diamond of the same carat weight graded in 2019. 

The measurements of the stones, however, were “quite different” due to the fact that the two materials have a different specific gravity, Hlatshwayo and Eaton-Magaña wrote. 

The specific gravity of diamond is 3.52 while moissanite’s is 3.22, which means that moissanite, any moissanite, has to be slightly larger than a diamond to equal its carat weight. 

“Since the specific gravity of moissanite is smaller than diamond, it is less dense and needs to have a larger volume for the same weight,” GIA explained in an email to National Jeweler. 

In addition, the font used for the inscription on the moissanite was “distinctly different” from GIA’s usual font and, while GIA does not assign clarity grades to lab-grown moissanite, the stone in question is equivalent to a VVS2, while the clarity grade on the report for the natural diamond is VVS1.

The lab note in the fall edition of Gems & Gemology did not provide details on the other two lab-grown moissanite submitted with fraudulent inscriptions, as they did not come into the lab until after the article was written.
 
Those stones “were handled in a similar manner,” Hlatshwayo and Eaton-Magaña concluded.

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

The Latest

My Next Question webinar
Recorded WebinarsApr 12, 2024
Watch: What Jewelers Need to Know About Insurance

From cybersecurity liability to trade show coverage, insurance experts share tips on how to build the right policy.

Evil Eye Charm with Turquoise Disc
CollectionsApr 12, 2024
Piece of the Week: Lionheart’s Evil Eye Gemstone Charm

The charm is a modern rendition of the evil eye amulet that has been worn for thousands of years.

The Jewelry Symposium scholarship winners 2024
Events & AwardsApr 12, 2024
The Jewelry Symposium Announces 4 Scholarship Winners

Ahead of its trade show next month, TJS awarded free registration and accommodations to one jewelry professional and three students.

1-(3.18).JPG
Brought to you by
The Blueprint for Success in Scalable, Personalized Jewelry Retail

With Ho Brothers, you can unlock your brand's true potential and offer customers the personalized jewelry experiences they desire.

SRK Empire and SRK House
Policies & IssuesApr 11, 2024
SRK Exports’ Journey Toward Net Zero Impact

By the end of this year, SRK’s diamond manufacturing complexes will achieve net zero emissions, one of an impressive array of achievements.

Weekly QuizApr 11, 2024
This Week’s Quiz
Test your jewelry news knowledge with this seven-question quiz.
Take the Quiz
Steven Rosdal
IndependentsApr 11, 2024
Steven Rosdal, Co-Founder of Hyde Park Jewelers, Dies at 77

He is remembered for his charisma, passion, integrity, kindness, and wit.

Macy’s Herald Square store
MajorsApr 11, 2024
Macy’s Opens Books for Possible Buyout

The retailer also appointed two new board members, avoiding a proxy fight from a potential buyer.

Jewelers of America Fly In Washington, D.C.
Brought to you by
How Jewelers of America Represents Your Business

For over 30 years, JA has advocated for the industry, fought against harmful legislation and backed measures that help jewelry businesses.

AGS Conclave 2024 logo Austin
Events & AwardsApr 11, 2024
10 Can’t-Miss Sessions at AGS Conclave 2024

From lab-grown diamonds and AI to the inevitable Taylor Swift mention, here are some of Conclave’s most intriguing educational offerings.

Sylvie Jewelry model
CollectionsApr 10, 2024
Sylvie Launches New Nature-Inspired Collection, ‘Tulira’

The bridal collection consists of 35 engagement rings and seven wedding bands.

Rolex Oyster Perpetual Deepsea in 18-karat yellow gold
WatchesApr 10, 2024
These Are Rolex’s New Watches for 2024

The crown introduced a dozen timepieces in Geneva, including a heavy metal version of its deep-sea divers’ watch.

Levy’s Fine Jewelry diamond education
IndependentsApr 10, 2024
Levy's Fine Jewelry Explores Diamond History

The family-owned jeweler has a new education section on its website dedicated to the history of diamond cutting.

With Clarity NFL wedding bands
CollectionsApr 10, 2024
With Clarity Partners With NFL on Wedding Bands

The limited-edition men’s rings can be customized with one of 12 team logos.

Asian Star’s diamond manufacturing facility in India
SourcingApr 10, 2024
Compliance, Caution, and Concern: The Current Outlook of Indian Diamantaires

There is a willingness to comply with new government-mandated regulations, with an insistence that they should be practical and realistic.

Chrono24 watch inspection lab
WatchesApr 09, 2024
Chrono24 Debuts Pre-Owned Watch Authentication Program

The program, now live in Europe, will roll out to the U.S. this summer.

6.21-carat fancy vivid pink diamond
AuctionsApr 09, 2024
Phillips to Offer 6.21-Carat Vivid Pink Diamond

Colored gemstones and signed jewels are the focus of its upcoming Geneva sale.

Lucapa rough colorless and pink diamonds
SourcingApr 09, 2024
Former De Beers Exec Appointed to Lucapa Board

Stuart Brown, who was De Beers’ CFO and interim CEO, is now Lucapa’s independent non-executive chairman.

Jewelers for Children POS System Donations
MajorsApr 09, 2024
Jewel360 Announces New POS Integration, JFC Partnership

The point-of-sale software can now prompt customers to round up their credit card purchases as a donation to Jewelers for Children.

Bharat Ratnam, a Mega Common Facilitation Centre (CFC)
SourcingApr 09, 2024
Reinvigorating SEEPZ, the Epicenter of India’s Studded Jewelry Exports

The zone’s modernization will enhance and increase India’s jewelry manufacturing capabilities while aiding small and mid-sized businesses.

Charles & Colvard moissanite bypass engagement ring
SourcingApr 08, 2024
Charles & Colvard Debuts B2B Portal for Moissanite

Select independent jewelers and retailers can now purchase moissanite through Charles & Colvard Direct.

Amber Rank
Events & AwardsApr 08, 2024
AGS Announces First Recipient of ‘Women in Leadership’ Scholarship

Amber Rank of Exclusively Diamonds will receive mentorship, registration to AGS’s 2024 Conclave, and $500.

Jaeger-LeCoultre citrine pinky-ring watch
AuctionsApr 08, 2024
Sotheby’s ‘Rough Diamonds’ Sale Is All About … Watches

The auction will take place Thursday and is underground, literally.

JOGS logo
Events & AwardsApr 08, 2024
JOGS Show Returns to Las Vegas for a Second Year

The trade show is moving downtown to the Expo at World Market Center.

Brilliant Earth and Jane Goodall collaboration logo
MajorsApr 05, 2024
Brilliant Earth Partners with Jane Goodall

The company is teaming up with the Jane Goodall Institute to promote ethical practices and environmental conservation.

Monica Rich Kosann Slim Heart Locket in gold and Jacquelyn Jablonski
CollectionsApr 05, 2024
Piece of the Week: A Locket for Autism Acceptance Month

Monica Rich Kosann created the “Slim Heart” locket in partnership with model and philanthropist Jacquelyn Jablonski.

Professor Frank Fraley teaching
Events & AwardsApr 05, 2024
BIJC’s Jewelry Education Program for High School Students Begins

“The Future Jewelers Academy” kicked off at the Brooklyn STEAM Center this week.

703 carat Tanzanite
SourcingApr 04, 2024
703-Carat Tanzanite Sets Guinness World Record

Carved by Naomi Sarna, the “L’Heure Bleu” is now the world’s largest cut tanzanite.

×

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