Holding 'The Rock', a 228.31-carat pear diamond is Christie’s international head of jewellery, ??Rahul Kadakia. Source: Christie's

Rahul Kadakia, international head of jewellery at Christie’s

“The Rock”, at 228.31 carats, is the largest white diamond to ever hit an auction block. It's been in the hands of private owners for the last 20-years.