Helen Molesworth, Specialist of Jewellery department of Christie's London shows the "Poltimore Tiara" from Princess Margaret's collection which estimate to fetch 150,000 - 200,000 pound sterlings, in Christie's Press Preview of Jewellery Collection of Pri [Getty Images]

Helen Molesworth, Specialist of Jewellery department of Christie's London shows the "Poltimore Tiara" from Princess Margaret's collection which estimate to fetch 150,000 - 200,000 pound sterlings, in Christie's Press Preview of Jewellery Collection of Princess Margaret, Impressionist & Modern Art and Post-war & Contemporary Art at ong Kong Convention & Exhibition Centre, Wan Chai. The auction will take place at Christie's London on June 13. 26 May 2006. (Photo by Dustin Shum/South China Morning Post via Getty Images) — see more

Helen Molesworth, Specialist of Jewellery department of Christie's London shows the "Poltimore Tiara" from Princess Margaret's collection which estimate to fetch 150,000 - 200,000 pound sterlings, in Christie's Press Preview of Jewellery Collection of Princess Margaret, Impressionist & Modern Art and Post-war & Contemporary Art at ong Kong Convention & Exhibition Centre, Wan Chai. The auction will take place at Christie's London on June 13. 26 May 2006. (Photo by Dustin Shum/South China Morning Post via Getty Images)

Helen Molesworth, Specialist of Jewellery department of Christie's London shows the "Poltimore Tiara" from Princess Margaret's collection which estimate to fetch 150,000 - 200,000 pound sterlings, in Christie's Press Preview of Jewellery Collection of Princess Margaret, Impressionist & Modern Art and Post-war & Contemporary Art at ong Kong Convention & Exhibition Centre, Wan Chai. The auction will take place at Christie's London on June 13. 26 May 2006. (Photo by Dustin Shum/South China Morning Post via Getty Images) — see more

Helen Molesworth, Specialist of Jewellery department of Christie's London shows the "Poltimore Tiara" from Princess Margaret's collection which estimate to fetch 150,000 - 200,000 pound sterlings, in Christie's Press Preview of Jewellery Collection of Princess Margaret, Impressionist & Modern Art and Post-war & Contemporary Art at ong Kong Convention & Exhibition Centre, Wan Chai. The auction will take place at Christie's London on June 13. 26 May 2006. (Photo by Dustin Shum/South China Morning Post via Getty Images)

Helen Molesworth, Specialist of Jewellery department of Christie's London shows the "Poltimore Tiara" from Princess Margaret's collection which estimate to fetch 150,000 - 200,000 pound sterlings, in Christie's Press Preview of Jewellery Collection of Princess Margaret, Impressionist & Modern Art and Post-war & Contemporary Art at ong Kong Convention & Exhibition Centre, Wan Chai. The auction will take place at Christie's London on June 13. 26 May 2006. (Photo by Dustin Shum/South China Morning Post via Getty Images) — see more

Helen Molesworth, Specialist of Jewellery department of Christie's London shows the "Poltimore Tiara" from Princess Margaret's collection which estimate to fetch 150,000 - 200,000 pound sterlings, in Christie's Press Preview of Jewellery Collection of Princess Margaret, Impressionist & Modern Art and Post-war & Contemporary Art at ong Kong Convention & Exhibition Centre, Wan Chai. The auction will take place at Christie's London on June 13. 26 May 2006. (Photo by Dustin Shum/South China Morning Post via Getty Images)

The Poltimore Tiara from the collection of the late Princess Margaret is held by Christie's Public relations manager Rhiannon Bevan-John at the Balmoral Hotel in Edinburgh. (Photo by Danny Lawson - PA Images/PA Images via Getty Images) — see more

The Poltimore Tiara from the collection of the late Princess Margaret is held by Christie's Public relations manager Rhiannon Bevan-John at the Balmoral Hotel in Edinburgh. (Photo by Danny Lawson - PA Images/PA Images via Getty Images)

The Poltimore Tiara from the collection of the late Princess Margaret is held by Christie's Public relations manager Rhiannon Bevan-John at the Balmoral Hotel in Edinburgh. (Photo by Danny Lawson - PA Images/PA Images via Getty Images) — see more

The Poltimore Tiara from the collection of the late Princess Margaret is held by Christie's Public relations manager Rhiannon Bevan-John at the Balmoral Hotel in Edinburgh. (Photo by Danny Lawson - PA Images/PA Images via Getty Images)