Turkish Iznik geometric pattern 7 7/8"x7 7/8" (20cm x 20cm) ceramic tile. Original pattern is 13th century Seljuk pattern and similar pattern was used on 16th-17th century Ottoman Iznik tiles. These tiles are 1/4" thick. Black section of these tiles is raised/textured (in-relief form). They have layer of glaze on them and they can be used at moist areas. First two pictures show 1 tile and last shows 4 of these tiles. Pictures shows light reflection from black raised sections (these are not stains or color differences, it is solid black color).