Most famously, the Poltimore tiara, which Margaret wore on her wedding day and throughout her life, sold for £926,400.
The tiara gets its name from the original owner – Florence Bampfylde, Lady Poltimore.
It was made for her by Garrard around 1870, and she wore it to the 1911 coronation of King George V.
Lady Poltimore’s grandson, the 4th Baron Poltimore, auctioned the tiara in 1959 and Princess Margaret snapped it up for just £5500.
source: express.co.uk