Fit for a queen: A pink tourmaline and diamonds add majesty to this brooch tribute.

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 intricate shape of the Williamson Diamond Brooch is on full display for all to admire on this 99.99% pure gold coin, the second in our Crown Jewels series. On your coin’s reverse, the brooch’s five-petalled flower is adorned with a pink tourmaline gemstone and 28 round-cut diamonds, all set in a platinum plated mount, which extends its luxurious shine to the floral elements on the reverse and the effigy on the obverse.

Second piece 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 gold 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.

Pretty pink tourmaline. Graded AAA quality, a 0.50-carat round-cut Fancy Pink tourmaline gemstone stands in for the brooch’s central stone on your coin’s reverse, where it is set in a sterling silver-and-platinum-plated mount.

Incomparable diamond sparkle. Also set in the platinum-plated mount are 28 round-cut diamonds (0.41 carat total weight) that bring some of the original brooch’s sparkle to this collectible tribute.

Platinum plating. The royal brooch’s shape also inspired the floral accents engraved on both sides of the main flower, and all of these elements are plated with platinum.

Premium packaging. Your encapsulated coin comes packaged in a premium wooden case with a black beauty box.

Beauty and rarity. Previous crown- and tiara-themed coins sold out quickly, and only 225 coins are available to collectors worldwide.

Special certificate. In addition to the serialized certificate from the Royal Canadian Mint (the Royal Canadian Mint certifies all of its collector coins), your coin comes with an additional certificate of authenticity for the precious stones.

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

"To capture the look of this distinctive royal brooch, I focused on the movement of the flower petals and the natural flow within this floral design. You'll notice the petals aren't flat, there's a natural curl to them. Also, the original brooch has the appearance of symmetry, but when you look more closely, those petals are not, in fact, identical; as a result, I treated the petals like the blades of a windmill, sculpting each one individually, and then I applied a similar approach to the floral accents on the side. The diamonds on the petals are also faceted to bring out the shine, and it took considerable work to get all of the relief to reflect light in a way that embodies the elegance and sparkle of the royal statement piece it represents."

– Cecily Mok, Engraver

About the design

Your coin is encapsulated and elegantly presented in a Royal Canadian Mint-branded wooden case 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. Re-creating the look of the original brooch, an engraved five-petalled jonquil flower is adorned with a silver-and-platinum-plated mount consisting of a 0.50-carat round-cut pink tourmaline gemstone and 28 round-cut diamonds (0.41 carat total weight). The stylized floral accents engraved on both sides of the sparkling centrepiece are also inspired by the royal brooch and are plated with platinum. The obverse features the effigy of His Majesty King Charles III by Canadian artist Steven Rosati.

Product # 246128

$200 Pure Gold Coin - Williamson Diamond Brooch (2025)