Rio Tinto Appoints New Head of Diavik Mine
Matthew Breen will take over as chief operating officer, succeeding Angela Biggs, the first woman to lead the mine.

Biggs started at Diavik in November 2017 as vice president of finance for the mine.
She served as general manager of operations before Rio Tinto appointed her president and COO in December 2021.
Biggs was the first woman to run the mine and manage its 1,000-plus employees.
Rio Tinto said she will be taking a period of leave before returning to the company in a different role.
Matthew Breen will replace Biggs as COO, effective Dec. 8.
Breen has worked as the general manager of operations at Diavik for the past year and a half after two decades of working at different mines all over the world.
He will lead Diavik and its 1,230 employees as they prepare to go underground on another pipe in order extend the mine’s life into early 2026.
“I am delighted that Matt will be leading the team at Diavik Diamond Mine as it continues to supply our customers with high quality, responsibly sourced Canadian diamonds, while preparing to leave a positive legacy in partnership with our community and government partners,” said Rio Tinto Minerals Chief Executive Sinead Kaufman.
“I would like to thank Angela for her six years at Diavik during which time she has shown strong leadership and care during challenging times.”
The Latest

At the 2025 World Series, the Los Angeles Dodgers’ Yoshinobu Yamamoto sported a custom necklace made by California retailer Happy Jewelers.

The brand’s seventh location combines Foundrae’s symbolic vocabulary with motifs from Florida’s natural surroundings.

The retailer also shared an update on the impact of tariffs on watch customers.

From educational programs, advocacy, and recent MJSA affiliation, Jewelers of America drives progress that elevates businesses of all sizes.

All proceeds from the G. St x Jewel Boxing raffle will go to City Harvest, which works to end hunger in New York City.


Courtney Cornell is part of the third generation to lead the Rochester, New York-based jeweler.

Former Signet CEO Mark Light will remain president of Shinola until a replacement for Ulrich Wohn is found.

Kindred Lubeck of Artifex has three rings she designed with Anup Jogani in Sotheby’s upcoming Gem Drop sale.

The company focused on marketing in the third quarter and introduced two new charm collections, “Pandora Talisman” and “Pandora Minis.”

The jewelry retailer raised its full-year guidance, with CFO Jeff Kuo describing the company as “very well positioned” for the holidays.

Ahead of the hearing, two industry organizations co-signed an amicus brief urging the court to declare Trump’s tariffs unlawful.

Stuller COO Belit Myers will take on the additional role of president, with all changes effective at the start of 2026.

Smith cautions retailers against expending too much energy on things they can’t control, like the rising price of gold.

Citrine and topaz are birthstones fit for fall as the leaves change color and the holiday season approaches.

The family-owned jeweler will open its fourth store in Florida in late 2027.

The NYPD is looking for three men who stole a safe and jewelry valued at $3.2 million from the home of a jeweler in Jamaica Hills, Queens.

The trade organization also announced its executive committee and five new directors.

The “Have a Heart x Diamonds Do Good” collection is championed by model and humanitarian Flaviana Matata and will benefit her foundation.

The ring, set with a nearly 17-carat Kashmir cabochon sapphire, sold for $1 million.

This “Mother Father” spinner necklace from Heavenly Vices Fine Jewelry draws inspiration from Victorian Era jewelry.

The suspects were rounded up in Paris and its suburbs on Wednesday night, but none of the stolen jewels were recovered with them.

Experts share top tips on how to encourage positive reviews and handle negative feedback.

Sponsored by the Gemological Institute of America

The suspect faces charges in the August robbery of Menashe & Sons Jewelers and is accused of committing smash and grabs at two pawn shops.

The “Lumière Fine” collection was born from designer Alison Chemla’s interest in the transformative power of light.

Show off your spooky side with these 12 festive jewels.























