-Diamond cut, carat, color, and clarity

Australia or elsewhere becomes such a great piece of diamond jewelry after the right diamond cut, polish and setting.

Diamonds are magnificent objects, sometimes diamond-and-platinum brooch creations. Other is a white gold necklace with diamonds and pearls. Diamond rings, diamond pendants and diamond rings are probably the most created diamond jewelry.

There are also some strange diamond creations like a corsage of Princess Mathilde, niece of Napoleon Bonaparte, made with 2,600 diamonds.

A other diamond art object is a platinum eternity ring with 35 baguette diamonds created in 2002 based on Marilyn Monroe's ring from her 1954 marriage to Joe DiMaggio. As one can see there is no limit to creativity together with diamond objects.

An unusually cut blue diamond with a royal history could fetch as much as $13 million when it goes under the hammer at Christie's.

A blue diamond are rare, and the 35.56 carat Wittelsbach Diamond has often had its color and clarity compared to the famed Hope Diamond, which is on display at the Smithsonian Institution in Washington.

The Wittelsbach Diamond is smaller than the Hope Diamond. The Wittelsbach Diamond was a favorite of European rulers for centuries. King Philip IV of Spain purchased the stone in 1664 and made it part of the dowry for his teenage daughter, the Infanta Margarita Teresa. Though she died relatively young, the diamond remained with her husband, Leopold I of Austria, and passed through a succession of his heirs.

The diamond got the Wittelsbach name after 1722 when Leopold's granddaughter married Charles of Bavaria, a member of the Wittelsbach family.

The diamond stayed with the Wittelsbach family until some time after 1918, when it was lost in the aftermath of World War I. Christie's first auctioned the Wittelsbach diamond in 1931, after which it disappeared from the public eye.

The large Wittelsbach diamond resurfaced in the 1960s, when a jeweler recognized its historical significance and refused to re-cut it.

Francois Curiel, Christie's international head of jewelry, described the diamond as "museum quality." It was the centerpiece of Christie's London jewelry sale.