PEAR-SHAPED

In November 2011, the Sun-Drop Diamond of South Africa, a giant pear-shaped yellow gem weighing 110.3 carats, sold for more than $10.9 million at auction, beating previous records for a jewel of its type. Including commission, the unidentified telephone bidder paid almost $12.4 million for the gem. Other lots at the $70 million sale included a white cushion-shaped diamond weighing 38.88 carats that sold for almost $7 million, including commission.

HEART-SHAPED

In May 2011, Christie's fetched $10.9 million for a 56-carat heart-shaped diamond that was internally flawless and $7.1 million for a 130-carat Burmese sapphire. Sotheby's got $12.7 million for a rare emerald-and-diamond tiara that a fabulously wealthy German prince, Guido Henckel von Donnersmarck, commissioned for his second, Russian-born wife around 1900. An intensely pink 11-carat diamond from the mines of India sold for $10.8 million.

INTENSELY PINK

In November 2010, a rare pink diamond smashed the world record for a jewel at auction, selling for more than $46 million to well-known London jeweler Laurence Graff. Four bidders competed for the pink diamond, which was last sold 60 years earlier by New York jeweler Harry Winston. The seller chose to remain anonymous. The 24.78-carat "fancy intense pink" diamond immediately became known as "The Graff Pink."

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