Grading

GIA Sees Blue Diamond That’s Synthetic-Natural Composite

GradingMay 03, 2017

GIA Sees Blue Diamond That’s Synthetic-Natural Composite

The 0.33-carat stone has a very thin layer of CVD-grown Type IIb diamond on top that earned it a grade of fancy blue.

This is the 0.33-carat fancy blue diamond that the Gemological Institution of America determined was a synthetic-natural composite. When asked about the color of the diamond--which does not appear to be all that blue--the GIA said pale colors are difficult to photograph. (Photo by Sood Oil (Judy) Chia.)

New York--The Gemological Institute of America reports that a mined white diamond with an extremely thin layer of blue lab-grown diamond on top was submitted to its New York laboratory recently.

According to an article published online now and slated for the summer print edition of “Gems & Gemology,” the 0.33-carat stone is a composite of CVD synthetic Type IIb diamond overgrowth on a natural Type Ia.

The lab-grown diamond layer is only 80 microns (0.003 inches) thick, but it’s enough for the diamond to grade as a fancy blue.

Though the GIA said the stone was not submitted as a lab-grown diamond, there were a few things that tipped off researchers.

As the article states, the diamond had both nitrogen and boron defects. Nitrogen defects are the most common defect found in natural diamonds, while boron is the element that gives diamonds a blue tint and is a rare impurity, which is why natural blue diamonds are so few and so valuable.

The GIA said it is “very unusual” to see these two elements together in a single diamond, as essentially what they were looking at was a mixed Type Ia and Type IIb diamond. The last time the GIA reported on one of these being found in nature was nearly 10 years ago, in the spring 2009 edition of “Gems & Gemology.”

Secondly, a detailed analysis conducted using the DiamondView machine showed a yellowish-green fluorescence zone at the top of the crown that had a clearly defined boundary visible along the interface layer on the crown facets.

This, combined with SiV- defects and phosphorescence, indicated to GIA researchers that the top layer was a diamond grown using the chemical vapor deposition (CVD) process.

The bottom of the stone, meanwhile, displayed blue fluorescence but no phosphorescence in the DiamondView and had a strain pattern in the pavilion, both of which are consistent with a stone that is a natural Type Ia diamond.

This is the not the first diamond that’s a synthetic-natural combination.

The GIA noted in its research article that CVD diamond films have been applied to natural diamonds since the 1960s, and the successful addition of CVD-grown diamond layers on top of mined diamonds happened in 1993.

But this is the first synthetic overgrowth on a natural diamond with a fancy color grade that the GIA said it has ever seen.

As the lab put it

in an email to National Jeweler on Tuesday: “Although CVD has been experimentally used to grow over natural diamond, it is not a simple process to perform with a favorable result on a gem-quality diamond.”

That is, apparently, until now.

GIA Director of Research and Development Wuyi Wang, along with New York-based GIA researchers Kyaw Soe Moe, Paul Johnson and Ulrika D’Haenens-Johansson, authored the article.
Michelle Graffis the editor-in-chief at National Jeweler, directing the publication’s coverage both online and in print.

The Latest

AuctionsSep 30, 2022
Red Diamond Earns $1.8M at Auction

The final hammer price blew the pre-sale estimate out of the water.

EditorsSep 30, 2022
The Best of Betty White’s Jewelry Sold at Auction

Michelle Graff recaps the cats, fortune cookies, and charm bracelets that caught her eye while covering the late actress’ estate sale.

Policies & IssuesSep 30, 2022
Voting Is Open for the Fairmined 100 Challenge’s Best Collection

The winners, picked by a group of judges and voted as the public’s favorite, will be announced in a webinar on Oct. 11.

Brought to you by
6 Steps to Start a Dynamic Company Culture

Learn how to better serve your employees, customers and community by having a dynamic and supportive company culture.

CollectionsSep 30, 2022
Piece of the Week: Fewer Finer’s ‘Family Bracelet’

The engravable piece is a perfect family heirloom.

Weekly QuizSep 29, 2022
This Week’s Quiz
Test your knowledge of the latest jewelry news with this quick test.
Take the Quiz
Supplier BulletinSep 29, 2022
How to Create an Engaging Experience and a Sparkling Reputation

Sponsored by Synchrony

SourcingSep 29, 2022
Q&A: Constantin Wild Celebrates 175 Years in the Colored Stone Business

The family business’ fourth-generation eponymous owner reflects on the milestone and the market today.

Brought to you by
Committing to an Ethical Diamond Business

While ethical mining is essential to a diamond business, they represent only a fraction of the responsibility bestowed on jewelers.

AuctionsSep 29, 2022
See the Top Lots in Christie’s Upcoming Rare Watch Sale

According to Christie’s, the auction is its most important single-owner watch collection ever.

CollectionsSep 29, 2022
Trove Has a New Proposal: Ring Boxes

The jewelry box brand is expanding with both single and double ring boxes in red, mint green, and white.

SourcingSep 29, 2022
AGTA Names Jennifer Heebner Editor-in-Chief of its Publications

The association has also hired a new marketing manager and announced two staff transitions.

Policies & IssuesSep 29, 2022
JA Members Return to Capitol Hill to Voice Jewelers’ Concerns

The topics up for discussion with lawmakers included inflation, rising interest rates, hiring challenges, and crime.

AuctionsSep 28, 2022
The 18-Carat ‘Fortune Pink’ Diamond Could Sell for $35M

The pear-shaped fancy vivid pink diamond will lead the Christie’s Geneva Magnificent Jewels auction on Nov. 8.

SurveysSep 28, 2022
Consumer Confidence Rises in September

U.S. consumer confidence rose for the second consecutive month as gas prices fell.

MajorsSep 28, 2022
Artistry’s 2023 Catalog Is Out Now

The jewelry catalog features an updated layout and 160 pages of product.

MajorsSep 28, 2022
JFC’s 2022 ‘Hope for the Holidays’ Program Is an Adorable Menagerie

There are three designs to choose from this year, all featuring animals drawn by kids who have had wishes granted through Make-A-Wish.

AuctionsSep 27, 2022
In Betty White’s Blockbuster Estate Sale, Jewelry Held Its Own

Fine jewelry comprised three of the auction’s top 10 lots, though it could not top her director’s chair or scripts from “The Golden Girls.”

CrimeSep 27, 2022
3 Suspects in Beverly Hills Smash-and-Grab Robbery Arrested

A total of four suspects are now in custody with police still on the lookout for the remaining two.

ColumnistsSep 27, 2022
Creative Connecting: Fun Ideas for Holiday 2022 In-Store Events

From a “whodunnit” murder mystery to a permanent jewelry party, Duvall O’Steen and Jen Cullen Williams share a wealth of suggestions.

MajorsSep 27, 2022
Stuller Releases 2 Updated Catalogs Ahead of the Holiday Season

“Mountings 2023-2024” and “Diamonds & Gemstones 2023-2024” offer a vast selection of options to create custom pieces.

Events & AwardsSep 27, 2022
ICA’s 2023 Congress Will Be Held in Dubai

The event will be hosted by the Dubai Multi Commodities Centre from Feb. 15-17.

IndependentsSep 26, 2022
Roberson’s Fine Jewelry to Close After 42 Years

The store’s liquidation sale will showcase the mix of classic and unique jewels it’s known for stocking.

CollectionsSep 26, 2022
Go ‘Inside the Dream’ of Bulgari Via a New Documentary on Amazon Prime

It follows Creative Director Lucia Silvestri as she crafts the brand’s high jewelry collections.

Recorded WebinarsSep 26, 2022
Watch: What Jewelers Should Know About Insurance

From safeguarding showcases to appraisal liability, insurance experts Mark Devereaux and Andrew Chipman share insurance tips for jewelers.

TrendsSep 26, 2022
Vahan Collabs With Wolf on a Jewelry Box

It’s the first time in 50 years the brand has made something other than jewelry.

Events & AwardsSep 26, 2022
Texas Jewelers Association Rolls Out New Format for Design Competition

The competition takes place in tandem with TJA’s annual convention, known as the Texas Jewelers Roundup.

CollectionsSep 23, 2022
Pandora Reimagines Keith Haring’s Art in New Collection

The limited-run collection features figures from Haring’s iconic street art on charms, bracelets, rings, and more.

×

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