The Countess of Snowdon was photographed wearing it on various occasions, proving it was one of her favorite pieces. An anonymous buyer purchased the Poltimore tiara in 2006 for $1.7 million.

Princess Margaret and her husband had two children: David Armstrong-Jones, the 2nd Earl of Snowdon, and Lady Sarah Chatto. Here's what the royals are up to now.

Princess Margaret, Countess of Snowdon, was the sister to Queen Elizabeth II and second daughter of King George VI. Following the outbreak of World War II the young royal moved to Windsor Castle.

Princess Margaret, who later became Countess of Snowdon upon marriage, was born on August 21, 1930. The youngest daughter of King George VI and Queen Elizabeth, she was the only sibling of the ...

Born on May 14, 2002, Lady Margarita is the daughter of the 2nd Earl of Snowdon, David Armstrong-Jones, and his ex-wife Serena Armstrong-Jones, Countess of Snowdon.

He married Princess Margaret, the younger sister of Queen Elizabeth II, on 6 May 1960. The Countess famously wore the Rosse family diamond and emerald parure, comprising a tiara, necklace and earrings ...

Chris Jackson/Getty Images. Lady Margarita is the youngest child of Princess Margaret's son, David Armstrong-Jones, 2nd Earl of Snowdon, 61, and his ex-wife, Serena Armstrong-Jones, Countess of ...

Their daughter, Polly Fry, was born on May 28, 1960, less than one month into Armstrong-Jones' new marriage. ... "Her royal highness, the Princess Margaret, Countess of Snowdon, ...

Queen Elizabeth II, Britain's oldest monarch, had only one sibling, her sister Princess Margaret, who was cremated after her death in 2002. ... Princess Margaret the Countess of Snowdon.