A cushion-shaped internally 76.02-carat flawless Golconda diamond was auctioned for a record price of $21.47 million (£13.5 million) by Christie’s in Geneva on Tuesday evening.

The diamond, mined in

A 76-carat diamond billed as one of the most famous in the world is expected to fetch well over $15 million when it hits the auction block in November, Christie's said on Friday.

The colossal gem, wh