Swedish jewellery designer Efva Attling is to collaborate with Yoko Ono to benefit Doctors Without Borders.

30% of all proceeds from Attling's silver Imagine collection will be donated, and a specially created necklace in white gold and diamonds is to be put up for silent auction, running in Efva Attling stores and on her website from October 15 to December 10 - the day of the Nobel Peace Prize ceremony.