This pink diamond sold for a historic record of $18 million

[caption id="attachment_802934" align="aligncenter" width="600"] Coloured diamonds are now the world’s most expensive precious rocks.[/caption] A fancy 8.41 carat, pear-shaped, flawless pink diamond sold for a record $17.8 million in Hong Kong this week, over $3m more than what Sotheby's was expecting...