Premium Grade Nero Marquina Marble Octagon Mosaic Tiles w/ Thassos White Dots. Black Marquina Marble Honed 2 inch Octagon Mosaic Wall & Floor Tiles are perfect for any interior projects. The 2 inch Nero Marquina Venato Marble Octagon Mosaic tiles can be used for a kitchen backsplash, bathroom flooring, shower surround, dining room, entryway, spa. Our timeless Matte Nero Marquinia Black Marble Octagon Mosaic tiles with a large selection of coordinating products is available and include arabesque, fish scale, penny round, herringbone, basketweave mosaics, 12x12, 18x18, 12x34, subway tiles, moldings, borders, and more.