|The Lady Blunt|
The Lady Blunt Stradivarius has fetched a groundbreaking price each time it's been auctioned and made £6million in 2008.
Until recently it was owned by the Nippon Music Foundation - a Japanese body whose aim is to increase public interest in music and which has a large collection of priceless antique instruments.
The Lady Blunt violin, made by Stradivarius in 1721, fetched nearly £9.8m following the online auction
However the organization decided to pass the instrument on to benefit victims of the Japanese earthquake and tsunami.
An auction conducted by London-based online auction house Tarisio on Monday night attracted considerable interest around the world before it was finally sold to an unnamed bidder for the record sum.
Stradivarius, regarded as the finest violin maker in history, made the instrument in 1721.
However it didn't get its name until more than 150 years later when Lady Anne Blunt - who was the granddaughter of Lord Byron and a talented musician - took ownership.
Master craftsmanship: Experts said it was rare to find a Stradivarius in such pristine condition
Tests were carried out on violins made by Stradivarius and another renowned Italian violin maker, Guarneri del Gesu, along with eight 'modern' violins.
The early and late growth wood in the modern instruments had noticeable different densities not present in the older instruments.
Experts concluded that wood treatments used by the Italian craftsment may have contributed to the instruments' sound.
'The donation will be put to immediate use on the ground in Japan.'
Following the auction The Lady Blunt has been hailed as the best-preserved Stradivarius to be sold in 100 years.
Jason Price, director of Tarisio, added: 'Fine instruments appreciate in value just like fine works of art, and the Lady Blunt is the most significant violin that a collector can buy.
'In the world of stringed instruments, it is the equivalent of Leonardo da Vinci's Mona Lisa or Michelangelo's David.'
'It still shows the tool-marks and brushstrokes of Stradivari. The Lady Blunt is perhaps the best-preserved Stradivarius to be offered for sale in the past century.'