Natural colored diamonds and other colored stones did very well at the Sotheby's "Magnificent Jewels" sale in Geneva this week. The Roxburghe Rubies, a parure of a ruby and diamond necklace and earrings brought $5.77 million, five times the set's estimated price. A rare 2.52 carat vivid green diamond sold for $3.08 million. It was the largest vivid-green diamond ever to appear at auction and the sale set a new world-record price per carat for a green diamond at auction. Swiss jeweler Chatila paid $2.52 million for a 3.17-carat fancy intense blue diamond which set a new world-record price per carat for an intense blue diamond sold at auction. Chatila also paid $3.13 million for a 74.8-carat fancy vivid-yellow diamond ring. The sale brought in $36.68 million putting it safely above the pre-sale low estimate of $29.5 million. A total of 79 percent of the lots up for sale sold.