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Princess Margaret (1930-2002), wearing a tiara, dances with her husband, Antony Armstrong-Jones, 1st Earl of Snowdon at a ball in Washington DC in November 1965.

Princess Margaret wearing a tiara, dances with her husband, Antony Armstrong-Jones, Earl of Snowdon at a ball in Washington DC in November

Princess Margaret, Countess of Snowdon (1930-2002) pictured wearing a tiara and ornate necklace with her husband Antony Armstrong-Jones, 1st Earl of Snowdon at an official royal engagement in 1966..

Princess Margaret, Countess of Snowdon pictured wearing a tiara and ornate necklace with her husband Antony Armstrong-Jones, Earl of Snowdon at an official royal engagement in (Photo by Rolls Press/Popperfoto/Getty Images)

Tiara Mania: Queen Elizabeth of the United Kingdom's Turquoise Tiara worn by Princess Margaret

Tiara Mania: Queen Elizabeth of the United Kingdom's Turquoise Tiara worn by Princess Margaret

Tiara Mania: Teck Hoop Necklace Tiara worn by Princess Margaret, Countess of Snowdon

Tiara Mania: Teck Hoop Necklace Tiara worn by Princess Margaret, Countess of Snowdon

Princess Margaret wearing Persian Turquoise Parure

On her birthday, the turquoise tiara was given by Queen Elizabeth to her younger daughter, Princess Margaret. After her death in it's possible that this piece returned to the Royal jewel vaults.

HRH The Princess Margaret, Countess of Snowdon 1930-2002

Royal Tiara Challenge 2017 28 - Favorite “lost” Tiara: The Poltimore Tiara

Princess Margaret (right) with her family, husband Lord Snowdon (left) and children, Lord Linley and Lady Sarah Armstrong-Jones, (foregroud), during the Badminton Horse Trials in Gloucestershire on 18th April 1970. (Photo by Ray Bellisario/Popperfoto/Getty Images)

Princess Margaret (right) with her family, husband Lord Snowdon (left) and children, Lord Linley and Lady Sarah Armstrong-Jones, (foregroud), during the Badminton Horse Trials in Gloucestershire on April (Photo by Ray Bellisario/Popperfoto/Getty Images)

Princess Margaret contiuned to wear the lotus tiara, even after she acquired the Poltimore, and loaned it to her daughter-in-law, Serena Stanhope when she wed Viscount Linley.

Princess Margaret, Countess of Snowdon - London, UK, circa 1990 seen wearing the Papyrus tiara.

Download this stock image: Princess Margaret at Charity pop Concert at the Palladium November 1969 - B3P1EG from Alamy's library of millions of high resolution stock photos, illustrations and vectors.

Princess Margaret at Charity pop Concert at the Palladium November 1969 - from Alamy's library of millions of high resolution stock photos, illustrations and vectors.

Princess Margaret and Anthony Armstrong-Jones, with their son David Linley in the car, returning from holiday at London airport on 23rd September 1972. This image is one of a series taken by Ray Bellisario who was credited with being the 'original paparazzo' and someone who frequently upset the Royal Family with his informal and often unwelcome style of photography.

Princess Margaret and Anthony ArmstrongJones with their son David Linley in the car returning from holiday at London airport on September

Princess Margaret arrives with her children Lady Sarah Armstrong-Jones and David, Lord Linley at the Royal Opera House for a special performance to celebrate the 60th birthday of Queen Elizabeth ll on April 21, 1986 in London, England

Princess Margaret arrives with her children Lady Sarah Armstrong-Jones and David, Lord Linley at the Royal Opera House for a special performance to celebrate the birthday of Queen Elizabeth ll on April 1986 in London, England

Princess Margaret, in the Poltimore, besides the Duchess of Gloucester, in the emerald version of her palmette tiara, during the State Opening of Parliament

Princess Margaret, in the Poltimore, beside the Duchess of Gloucester, in the emerald version of her palmette tiara, during the State Opening of Parliament

Princess Margaret with the Earl of Snowdon and their children David, Viscount Linley and Lady Sarah Armstrong-Jones

Princess Margaret, the Countess of Snowdon, with her husband Anthony Armstrong-Jones, the Earl of Snowdon; and their children David Armstrong-Jones, Lord Linley; and Lady Sarah Armstrong-Jones.

Daughter of the Queen’s late sister, Princess Margaret, Lady Sarah, who turns 52 tomorrow, is one of the most low-key Royals yet holds a very special place in Her Majesty’s affections. Pictured: The Queen with Lady Sarah Armstrong-Jones

Margaret's down-to-earth daughter Sarah has been thrust into spotlight

AC Daughter of the Queen’s late sister, Princess Margaret, Lady Sarah, who turns 52 tomorrow, is one of the most low-key Royals yet holds a very special place in Her Majesty’s affections. Pictured: The Queen with Lady Sarah Armstrong-Jones