CLEAN : Worlds largest uncut diamond fails to sell in London

The transcript details an auction for a rough diamond weighing 5.44 carats. The bidding starts at a lower price and quickly escalates to millions of dollars. Despite reaching a high bid of $61 million, the diamond is not sold. The auctioneer emphasizes the stone's magnificence and its historical significance as one of the greatest stones ever discovered.

What was the weight of the rough diamond mentioned?

What was the highest bid mentioned during the auction?