Polishing the pink
Valued at twenty times the price of a white diamond, pink diamonds are also extremely rare with only around 50 or so put out to tender each year.
Pink diamonds comprise 0.03 per cent of global diamond production and 90% come from the remote Argyle mine in Australia, owned by Rio Tinto. For every million carats of rough diamonds produced at Argyle, less than one carat will be suitable for the tender which this year will include the three-heart shaped Argyle Semper Suite (pictured).