The rare white diamonds will be sold in Hong Kong

A 72.22 carat D-color pear-shaped flawless diamond is displayed at Sotheby’s auction house in London, on March 7, 2008. (BEN STANSALL, AFP/Getty Images / March 10, 2008)

A 72.22-carat diamond,so large it could fill a tablespoon, is expected to bring up to $13 million when it goes on the auction block.

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 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.