Yours to own: A pink-hued tribute to an iconic royal brooch.

One of Queen Elizabeth II’s most iconic brooches, the flower-shaped Williamson Diamond Brooch has a Canadian connection: its gorgeous pink diamond, one of the largest and finest of its kind, was a wedding gift from Canadian geologist John Thoburn Williamson. The extraordinary jewel was cut and set into a platinum-and-diamond brooch completed in 1953, the year of Queen Elizabeth II’s coronation, and was frequently worn throughout her seven-decade reign, appearing in family portraits, at State occasions and momentous celebrations — including the Silver Jubilee Service in 1977, and the weddings of two of her children.

The second coin in the Crown Jewels series takes a closer look at the Williamson Diamond Brooch. The brooch’s jonquil flower on this 99.99% pure silver coin is adorned with dazzling crystals on a rhodium plated setting, while a coloured glass stone stands in for the royal jewel’s priceless pink diamond.

Second coin in our Crown Jewels series.

Good to know

Second Crown Jewels coin. Launched in 2024, the Crown Jewels series takes a closer look at some of the Royal Family’s most magnificent heirloom brooches.

A royal brooch with a Canadian connection. This 99.99% pure silver coin features an interpretation of the Williamson Diamond Brooch. The jewel was designed around a stunning pink diamond that was presented to then-Princess Elizabeth as a wedding gift from Canadian geologist John T. Williamson.

Coloured stones. A pink-coloured glass stone stands in for the royal brooch’s pink diamond on your coin’s reverse, where the stone is surrounded by crystals.

Rhodium plated setting. The five-petalled flower at the centre of your coin’s reverse is plated with rhodium, with intricate cast elements that help re-create the look of the distinctive diamond brooch.

Matte proof finish. A matte proof finish (brilliant relief, satin field) allows the brooch to shine bright on your coin’s reverse.

A must-have for jewellery lovers. Mintage is limited to 6,000 coins and this one will likely sell out quickly.

Includes serialized certificate. The Royal Canadian Mint certifies all of its collector coins.

Did you know?

Discovered in Tanzania, the Williamson Diamond was a 54.5-carat rough stone that was cut into a 23.6-carat brilliant diamond, then placed at the centre of a platinum brooch composed of an additional 203 white diamonds.

Behind closed doors

"The brooch at the centre of the coin’s reverse is unquestionably the star here, but don't overlook the details that make up the floral accents on each side. Everything on this coin is slightly faceted to play up the shine and reflect light across the surface of the coin, creating that jewel-like sparkle."

- Cecily Mok, Engraver

About the design

Your coin is encapsulated and presented in a black Royal Canadian Mint-branded clamshell with a black beauty box.

The coin’s reverse features an interpretation of the Williamson Diamond Brooch frequently worn by Queen Elizabeth II throughout her seven-decade reign. Flanked by engraved floral accents inspired by the brooch’s shape, the jewel’s five-petalled flower is adorned with crystals and a pink-coloured glass stone at its centre on a rhodium plated setting. The obverse features the effigy of His Majesty King Charles III by Canadian artist Steven Rosati.

Product # 246127

$20 Fine Silver Coin - Williamson Diamond Brooch (2025)