The necklace, which consists of around 500 diamonds with a total weight of approximately 300 carats, was also worn during Queen Elizabeth's coronation.
The price was predicted to land between approximately 20-30 million kronor, but the bidding became unexpectedly lively. The rare piece of jewelry was finally sold for approximately 53 million kronor.
The unidentified buyer placed her bid over the phone. According to the auction firm Sotheby's, she is "in ecstasy" after the purchase.
She was ready to fight and she did, says Sotheby's Andres White Correal.
The high price is explained by the necklace's partially "mysterious" history. Some of the diamonds are believed to originate from the so-called Affair of the Necklace in 1780s Paris, a court scandal that damaged the reputation of then-Queen Marie-Antoinette and is believed to have paved the way for the French Revolution, in which the queen was later executed by guillotine.
In a later stage, the necklace is said to have been worn both at King George VI's coronation in 1937 and Queen Elizabeth II's in 1953.
Then it vanished. The necklace had not been seen for 50 years when it recently turned up in a private Asian collection, according to Sotheby's.
The diamonds are believed to originally come from the mythical Indian gold mine Golconda.
