ANTIQUES ROADSHOW host Mark L. Walberg discusses Northwest Coast Indian masks with appraiser Ted Trotta at the Burke Museum of Natural History and Culture. Seattle becomes the city that sparkles with the discovery of a late-16th-century diamond and enamel jewel. Other notable finds include a moose, elk and buffalo hide chair; an 1880s Crazy Quilt; and a white Steiff clown bear worth $2,500-$3,200.