In Tucson, Arizona, host Mark Walberg and appraiser Rosalie Sayyah are at the picturesque Arizona Inn for a conversation about traditional American Indian jewelry of the Southwest. ROADSHOW experts at the Tucson Convention Center continue their own tradition of discovering hidden treasure, including a vibrant 19th-century Navajo chief's blanket; a silver brooch made in the 1940s by then-struggling sculptor Jose DeRivero, whose works now grace the most noted museums and galleries; and a 1776 French harp, bought for a modest sum at an estate sale and identified as the work of Jean-Henri Naderman - harpmaker to such aristocrats as Marie Antoinette - that commands an estimated value of $60,000.