Antiques Roadshow (US)

Part 2 of 3 in Pittsburgh includes a 6.5 carat yellow mine cut diamond ring; a North American Indian club and pipe that may have belonged to Sitting Bull; and three Charles Darwin first editions, including "The Voyage of the Beagle," "On the Origin of Species" and "The Descent of Man." Also: centuries-old jewelry fashioned out of steel and iron.