LAS VEGAS (AP) - Want to own a 5-carat diamond from a Texas scammer? The jumbo jewel and other treasures confiscated by the U.S. Marshals Service are up for auction in Las Vegas this weekend. Buyers can preview the gold and silver bullion, coins, jewelry and watches from federal crime cases between 11 a.m. and 4 p.m. Friday at the Las Vegas Convention Center. The auction itself starts at 10 a.m. Saturday and will be simulcast on the Internet. Among the other items are 6.6 pounds of gold pellets from a Southern California resident caught up in a $100 million Medicare fraud scheme. The starting bid for that collection is $120,000. The Marshals Service auctions items from cases a few times a year. Proceeds benefit victims of crimes and supplement law enforcement programs.