Britain's Duchess of Cambridge's favourite accessory is a pair of Soru earrings.

Duchess of Cambridge

Duchess of Cambridge

The 34-year-old royal has not taken off the 18 carat yellow gold vermeil Soru Baroque Pearl Double Sided Earring worth £130 from the brand - which was launched by two Sicilian sisters Francesca and Marianna Doyle - over the past few weeks, and it is believed the items are her go-to accessory.

Speaking to the Mail Online about their celebrity clientele and Catherine's preferred item, which features the June birthstone and are handcrafted with baroque pearls and Swarovski crystals, the creative masterminds - who launched their label in 2013 - said: "We were absolutely thrilled to see the Duchess wearing our earrings to the Arts Awards and Wimbledon last week.

"[It symbolises] a pure heart and mind, innocent and faith ... with links to the moon and water they help to balance emotions."

The mother of two - who has two-year-old son Prince George and 14-month-old daughter Princess Charlotte with her husband Prince William - sported the signature accessory at an art ceremony held at London's National History Museum, and again to watch Serena Williams take home the trophy at Wimbledon on Thursday (07.07.16) last week.

It has been reported the brunette beauty found her latest staple at London's King's Road store Baar and Bass, which stocks Aya - the jewellery line founded by Britain's Prince Harry's former girlfriend Chelsy Davy - and she has not been spotted without them since.

Following the news Catherine has worn pieces from their label, the store has completely sold out of stock.

The co-founders explained: "There is now a waiting list for the pieces both there and online.

"[But] we are very proud to see her looking so beautiful in our jewellery!"