Sourcing

First Diamonds from Sierra Leone’s Tongo Mine Coming to Market

SourcingMay 09, 2022

First Diamonds from Sierra Leone’s Tongo Mine Coming to Market

Australian company Newfield Resources is developing the mine and will sell its production through Bonas Group in Antwerp.

20220506_Tongo Diamond Mine Sierra Leone.jpg
An entrance to the Tongo Diamond Mine in eastern Sierra Leone. Bonas Group will hold a tender sale of the first rough diamonds from the mine later this month.
Antwerp—The first sale of rough diamonds from Tongo, a new diamond mine in Sierra Leone, will take place later this month at the Bonas Group offices in Antwerp.

Newfield Resources Ltd., the company developing the mine, announced in late April it had inked an exclusive diamond sales and marketing agreement with Bonas for the mine’s production.

Via its partnership with Bonas, Tongo goods will be tracked from mine to market using Sarine Technologies’ traceability program, Newfield said.

The mine, which has been in the works for more than decade, is “well known for its high-quality material,” Bonas said.

Tender viewings of the Tongo material will take place on the first floor of the Bonas Group offices in Antwerp between May 16 and 20.

The sale is scheduled to close May 20 at 1 p.m. CET/7 a.m. EDT and will be an online, highest bid tender on Newfieldbids.com

Bookings for the tender are invitation-only, but requests can be submitted to Bonas Antwerp. Interested clients are requested to call the office at +32 (0) 3233 7080. 

 Related stories will be right here … 

Based in Australia, Newfield has been developing the Tongo Diamond Project since 2018, when it acquired the site from Stellar Diamonds. 

The project comprises two adjacent mining licenses covering a combined area of 134 square kilometers (about 52 square miles) in eastern Sierra Leone with five primary kimberlite pipes. 

The first two pipes Newfield will mine have been dubbed Kundu and Lando. 

Newfield said processing from the underground and surface at Kundu continues to yield “encouraging results,” with a high proportion of what’s recovered turning out to be gem-quality diamonds. 

It is believed Tongo will produce 8.3 million carats of diamonds over the span of its life, including an indicated and inferred resource of 3.03 million carats at Lando and 2.76 million carats at Kundu. 

Newfield employed 200 people at the mine as of March 31, including graduate trainees, contractors, and interns. Of the 200, 166 (83 percent) are local Sierra Leonians and 128 (64 percent) have permanent employment contracts, it said.

Twelve percent (about 20 people) of the local employees are women. Newfield said it intends to increase the number of women working at the mine, in line with its diversity policy.  

In addition to Tongo in Sierra Leone, Newfield is conducting diamond exploration in neighboring Liberia via two licenses covering 670 square kilometers (about 259 square miles), known collectively as the Kumgbo Kimberlite Project. 

The Latest

Pandora distribution facility Canada
MajorsApr 02, 2026
Pandora Opens New Canadian Distribution Center Amid Tariff Concerns

The new facility was also designed to better serve its growing customer base in Canada.

Michelle Yeoh Mikimoto
TrendsApr 02, 2026
Michelle Yeoh Fronts New Mikimoto Campaign

The campaign is a tribute to the year 1893, when Kokichi Mikimoto created the world’s first cultured pearl.

GIA President and CEO Pritesh Patel at GIA Taiwan campus
GradingApr 02, 2026
GIA Debuts New Campus in Taiwan

It is the only GIA school to offer the GIA Graduate Gemologist program in Chinese.

GIA iD100®
Brought to you by
Protect Your Customers and Your Business

You deserve to know what you are selling–to protect your customers as well as your business and your reputation.

DCA Second Spark Workforce Initiative Graphic
MajorsApr 02, 2026
DCA Launches ‘Second Spark’ Workforce Initiative

The initiative connects veterans and parents returning to the workforce with careers in jewelry retail.

Weekly QuizApr 02, 2026
This Week’s Quiz
Test your jewelry news knowledge by answering these questions.
Take the Quiz
Michael Angelo
MajorsApr 02, 2026
Hoover & Strong Names New National Sales Representative

The wholesale manufacturer and precious metals refiner has appointed Michael Angelo as its new national sales representative.

Pandora and Foundrae medallion jewelry
MajorsApr 01, 2026
Foundrae Sues Pandora for Allegedly Copying Its Medallion Designs

Foundrae also accused the jewelry giant of copying its mood board style of marketing.

TopImageCrop.jpg
Brought to you by
Is This You? Every Jeweler Has This Problem; We Have the Solution.

Every jeweler faces the same challenge: helping customers protect what they love. Here’s the solution designed for today’s jewelry business.

John Jacob Astor IV's Patek Philippe for Tiffany & Co., Battin & Co. pencil case
AuctionsApr 01, 2026
John Jacob Astor IV’s Titanic Pocket Watch Heads to Auction

A Patek Philippe for Tiffany & Co. timepiece owned by the American businessman who died on the Titanic will be offered at Freeman's Chicago.

Stock image of a Shell gas station
SurveysApr 01, 2026
Consumers’ Outlook Improves Again in March

The Conference Board’s Consumer Confidence Index edged up, with optimism about the present outweighing worries about the future.

Zach Bear and the Window Necklace Children’s Book from Zachary’s Jewelers
IndependentsApr 01, 2026
Zachary’s Jewelers’ Constance Polamalu to Release Children’s Book

The retailer’s Zach Bear gift comes to life in “Zach Bear and the Window Necklace,” which centers on curiosity, bravery, and helping.

Accredited Gemologists Association Logo
Events & AwardsApr 01, 2026
AGA Opens 2026 Gemological Scholarship, Research Grant Applications

Applications are open for the AGA Gemological Scholarship Program through May 15, and until June 2027 for the Gemological Research Grant.

National Jeweler columnist and Smart Age founder and CEO Emmanuel Raheb
ColumnistsMar 31, 2026
Q1 Clues That Reveal Where Your Jewelry Store’s Sales Are Heading

These customer behavior patterns say a lot about how successful your jewelry store is going to be this year, Emmanuel Raheb writes.

Mejuri Puzzle Collection Campaign Imagery
CollectionsMar 31, 2026
Mejuri Adds Silver to ‘Puzzle’ Collection

Mejuri’s popular collection of 18-karat yellow gold vermeil rings debuted in sterling silver alongside new “Puzzle” slider charms.

Ashley Longshore in Buddha Mama jewelry
CollectionsMar 31, 2026
Buddha Mama, Ashley Longshore to Host Pop-Up in Dallas

The Miami-based jewelry brand and the NYC-based artist will be in Dallas from April 9-11.

Tom Moses examining the “Motswedi” diamond
EditorsMar 30, 2026
Tom Moses Looks Back on His Decades at GIA

Moses, who will leave the lab in May after nearly 50 years, discusses his start in the business, gemstones that stand out, and what’s next.

Oscar Heyman Spring Catalog Aquamarine and Diamond Necklace and Platinum Opal, Sapphire, Emerald, Diamond Bracelet
TrendsMar 30, 2026
Oscar Heyman Debuts First Spring Catalog

The new catalog, which showcases 35 one-of-a-kind pieces of jewelry, is a compliment to the company’s popular holiday catalog.

Diavik Diamond Mine winter aerial shot
SourcingMar 30, 2026
Rio Tinto Hauls Last Load from Diavik

Production has ceased at the Canadian diamond mine, which has yielded more than 150 million carats of rough diamonds in its 23-year run.

Tanishq Westborough Massachusetts store
MajorsMar 30, 2026
Tanishq Opens First New England Location

The store opening marks the 10th United States location for the India-based jewelry retailer.

Saks Fifth Avenue door sign
MajorsMar 27, 2026
Saks Global Has Changed Its Mind About Closing These 3 Stores

Two Saks Fifth Avenue locations, one in Florida and one in California, and one Neiman Marcus store are off the chopping block.

Jimmy West celebrating 40 years with Leading Jewelers Guild
IndependentsMar 27, 2026
Jimmy West, Longtime LJG Executive Director, Dies at 72

West, who started in the art department at the Leading Jewelers Guild in 1979, is remembered for his patience, kindness, and dedication.

Itä Yari Whirl Ring Tesoro
CollectionsMar 27, 2026
Itä’s ‘Yarí Whirl’ Ring Tells Every Side of the Story

In the “Tesoro” version of the ring, our Piece of the Week, each side of the gold hexagonal nugget has a unique colored gemstone design.

Citizen Watch America President Jeffrey Cohen
WatchesMar 26, 2026
Q&A: Citizen Watch America President Jeffrey Cohen on Eco-Drive’s 50th Anniversary

Cohen discusses the evolution of Citizen’s light-powered technology, the brand’s cross-generational appeal, and tariffs.

Peter Smith Essentially Human: On Sales and Salespeople
IndependentsMar 26, 2026
Peter Smith Pens Book on Human Behavior in Sales

“Essentially Human: On Sales and Salespeople" reveals the underlying human traits and behaviors of the most successful sales professionals.

Lionheart Cassandane Collection Campaign
CollectionsMar 26, 2026
Lionheart Celebrates 13 Years of ‘Cassandane’

The collection features symbols of love, luck, and light, based on the story of Queen Cassandane and Cyrus the Great of Persia.

Instappraise NAJA
Events & AwardsMar 26, 2026
NAJA, Instappraise Introduce New Scholarship

It’s the third scholarship to be launched as part of the partnership to help appraisers advance their professional credentials.

CASE Awards Graphic
Events & AwardsMar 26, 2026
JA Still Accepting Entries for 2026 CASE Awards

The deadline for entries in the jewelry design competition has been extended to April 3.

×

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