The snaps, posted to Instagram, gave an intimate peek into the Garden Room, which is decorated with plush gold and red furniture. The room was bathed in natural sunlight and oozed class and refinement. The photos were accompanied by text, which explained: "This room was created by Queen Elizabeth The Queen Mother from two rooms and offers beautiful views of the garden.
"Today it is used for welcoming official visitors and features musical instruments, family photographs and works of art."
The caption drew attention to one item, which had royal fans purring in appreciation.
"In a musical corner, The Prince’s harp, which was a gift from the Victor Salvi Foundation, can be found," it said.
"On closer inspection, visitors will spot the harp’s design incorporates The Prince of Wales feathers and Welsh symbols, including daffodils and dragons."
Fans were quick to share their thoughts on the stunning musical instrument.
One wrote: "What a fabulous harp. I have seen pictures of it at Salvis a while back.
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"Now that would be amazing to see and play too!"
A second enthused: "That is a beautiful instrument."
The Salvi harp even caught the attention of admirers from foreign shores, with one commenting: "MAGNIFIQUE et SUPERBES INSTRUMENTS de MUSIQUE...COMPLIMENTS....." (Magnificent and superb musical instrument compliments).
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The instrument is played by the Royal Harpist, a position created by Queen Victoria.
The role is currently filled by Alis Huws, a graduate of the Royal Welsh College of Music and Drama.
Clarence House used to be the residence of Princess Margaret, before her marriage to Anthony Armstrong Jones.