Queen Camilla sparked speculation with what appears to be a previously unseen sapphire and diamond brooch fashioned in the shape of a crown during today's Maundy Thursday service.
The striking piece, which does not seem to originate from the Royal Collection, has prompted theories that King Charles presented it to his wife ahead of their 21st wedding anniversary later this month.
Social media account Remoulade Sauce, which identifies outfits worn by members of the Royal Family, posted: "I spy a gorgeous new brooch today and am working hard to try to find it!
"It looks similar to both an art deco piece by René Boivin that was part of the collection belonging to Daisy Fellowes, and also a similar piece by Bvlgari that was auctioned in Hong Kong recently. I hope to find an answer soon!"
Queen Camilla sparks speculation with new jewel on Maundy Thursday
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A fan replied: "It's gorgeous, I hope it's tied to a special meaning for her." Another said: "Beautiful! Who makes these? Just lovely."
A third commented: "Devine! I cannot wait to hear what you've discovered!"
The Queen complemented the eye-catching jewel with a navy pleated dress and coordinating embroidered coat from Christian Dior.
A Philip Treacy hat completed her outfit for the occasion at St Asaph Cathedral in North Wales.
Queen Camilla donned Dior for her Maundy Thursday appearance
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The royal couple's visit to St Asaph Cathedral marked a significant milestone in the ceremony's lengthy history.
This was the first occasion in 800 years that the traditional Maundy Thursday service had taken place in North Wales.
Wales has hosted the event only once before, when Queen Elizabeth and Prince Philip attended St David's in Pembrokeshire back in 1982.
That Pembrokeshire location also holds the distinction of being Great Britain's smallest city.
Queen Camilla pictured inside St Asaph Cathedral
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Maundy Thursday, alternatively called Holy Thursday, falls on the fifth day of Holy Week and represents one of the most significant occasions in the lead-up to Easter Sunday.
Following tradition, King Charles presented Maundy Money to members of the local community during the service.
The number of recipients corresponds to the sovereign's age, meaning the 77-year-old monarch gave gifts to 77 men and 77 women in recognition of their contributions and service.
King Charles presented Maundy Money to members of the local community during the service
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Each recipient received a pair of purses, one red and one white.
The white purse contained specially minted silver Maundy coins, whilst the red purse held two commemorative pieces marking Queen Elizabeth's birth centenary and the 50th anniversary of the King's Trust, Charles's charitable foundation.
The King and Queen are expected to join the Prince and Princess of Wales at St George's Chapel, Windsor for Easter Sunday services.