Scientists find ‘missing ingredient’ for pink diamonds after studying Western Australia’s Argyle mine

Researchers say discovery of trigger' that caused diamonds to rise closer to earth's surface could help efforts to find more of the rare and valuable stones

Scientists said on Tuesday they have found the missing ingredient" for pink diamonds - some of the world's most expensive stones due their rarity and beauty - and the discovery could help find more.

More than 90% of all the pink diamonds ever found were discovered at the recently closed Argyle mine in the remote north-west of Australia.