72.22-carat Diamond Could Fetch $13mil at Sotheby's Auction

Rare rock 'so big it could fill a tablespoon'

If diamonds are a girl's best friend than a rare gem about to hit the auction block must have a lot of gal pals.

A 72.22-carat diamond, so large it could fill a tablespoon, is expected to bring up to $13 million when Sotheby's puts it up for sale next month, Reuters reported today.

Cut from an original rough diamond, the D-color, flawless gem is prized for its pear shape and GIA-graded excellent polish and symmetry. D-color is actually colorless and considered the most highly valued.

It was previewed in Manhattan on Monday and will be offered on April 10 at Sotheby's Hong Kong galleries, which estimates its value at $10 million to $13 million. The buyer has the privilege of naming the stone.

Pictured: A Sotheby's employee holds the rare rock. (Photo by the Associate Press/Alastair Grant.)

Not to be outdone, next month we're going to sell the 1/2-carat "genuine" diamelle tennis bracelet we picked up on QVC one night. "Swanky" is a word that comes to mind.