Glinting semiprecious Stone Mosaics in mother-of-pearl are waterproof and great for showers and backsplashes (but not suited for floors subject to heavy wear). The small mosaic pieces are mounted on 3/4-inch backing-stone tiles and can cleverly interlock, creating visually seamless installations. 150 East 58th Street, 7th Floor, New York, NY 10155; 888-845-3487; parisceramics.com. circle 739