Tau Ceramica’s Onice is durable, glass-embedded ceramic tile that looks like onyx stone. Well-suited for use as flooring or backsplash, the tile is offered in polished and semi-polished finishes, and in ocre (shown) and other colorations. (Tau Ceramica is one of 200 manufacturers represented by Tile of Spain.) Tile of Spain. www.tileofspainusa.com.