For the photo, she wore a long sleeved blue dress.
It had a lighter blue, purple, black and white pattern across it.
Camilla’s dress is believed to be from Sophie Dundas.
Similar designs are on sale for around £145.
She often wears charm bracelets, including a gift from Prince Charles.
Speaking on the jewels, Charlotte White, Head of Design at 77 Diamonds, Europe’s largest online jeweller told Express.co.uk: “Camilla absolutely loves jewellery.
“On formal occasions, she regularly dons opulent necklaces encrusted with gemstones.”
She added: “The pandemic has heralded an emphasis on daywear and some of Camilla’s notable everyday pieces carry special significance, offering us a small glimpse into what she holds dear.”
The royal also wore a pair of gold and pearl drop earrings.
Camilla styled her short locks into her signature flicked blow dry.
She opted for a natural make up look, with a pink lip gloss and slick of eyeshadow.
Royal fans shared their appreciation of the pictures.
Posting on Twitter one wrote: “Happy Birthday Your Royal Highness Camilla, Duchess of Cornwall. You are truly an inspiration with the amazing and noteworthy causes you champion #DuchessOfCornwall.”
Another user ‘Cedric’ stated: “Wishing you a very happy birthday HRH, lovely photo.”
‘LoDeCannes’ added: “Sooo Nice! You are beautiful.”
‘Cambridge Dearly’ said: “Beautiful picture of Camilla! Happy 75th birthday!”