US singer Kelly Clarkson paid £126,000 hammer at Sotheby's on July 10 last year but the Jane Austen's House Museum has until September 30 to raise the money following the temporary export ban placed by culture minister Ed Vaizey.
Including premium, the full amount is £152,450 for the gold and gem-set ring, which is one of only three pieces of Austen's jewellery known to exist.
