Twice Olympic shooting champion Michael Diamond has been arrested for drunk driving and charged with firearms offences, the Australian Olympic Committee says on Monday.

The Indian government says it is still seeking to reclaim the priceless Koh-i-noor diamond from Britain, despite the Supreme Court being told otherwise.

A 1,111 carat "high quality diamond" is discovered at a mine in Botswana, said to be the biggest find in more than a century.

Barefoot, with sweat pouring down their naked chests, 50 men slave in the depths of the Central African forest digging for diamonds in a sandy pit half the size of a football pitch.