The "Magnificent Jewels" sale by Sotheby's, which is slated on December 4, 2007, will feature three jewels of natural pearl and diamonds from Sotheby's Kelly and Calvin Klein collection. The owners of the jewels, the Kleins, had purchased them for $2.2 million-$3.1 million including a necklace, pendant and ear clips at Sotheby's 1987 auction of "The Jewels of the Duchess of Windsor" in Geneva.

The pearls will make a worldwide pre-sale exhibition in Asia, Europe the Middle East and the United States as well as Sotheby's New York, between Nov. 29-Dec. 4, before the scheduled auction.

The three pieces have moved through royal hands in the past. Queen Mary once owned the $1.5 million-$2 million single-strand natural pearl and diamond necklace designed by Cartier and containing 28 natural pearls with an emerald and diamond clasp, and gifted it to her son, the Duke of Windsor. Also designed by Cartier, circa 1950, the natural pearl and diamond pendant is crafted with a 190.6-grain pearl covered with single-cut and round diamonds, valued at $400,000-$600,000. Designed by Van Cleef and Arpels, circa 1957, the pair of natural black and white pearl and diamond ear clips are valued at $300,000-$500,000.