What better place to discuss diamond rings and antique diamond cuts than Las Vegas, Nevada's Little White Wedding Chapel, where ANTIQUES ROADSHOW host Mark L. Walberg meets appraiser Gloria Lieberman. At the Las Vegas Convention Center, collectors and appraisers are a match made in heaven, unveiling such fascinating treasures as an early example of American-made porcelain - an 1870s Belleek vase made in Trenton, New Jersey; a pair of beautiful - and valuable - Art Nouveau posters; and an iconic movie prop - purchased for $195 at a southern California swap meet - and identified as the Barranca Airways prop plane used in the 1939 film Only Angels Have Wings, the Oscar-winner for Special Effects. This legendary piece of movie magic is divined to be worth $4,000 to $5,000.