Circle Geometric Black Mosaic The Circle Geometric Black Mosaic is apart of a wide collection of Geometric Mosaics. This masterpiece is an entirely handmade mosaic reproduction created using the techniques of ancient romans called " Opus tessellatum" , cubic stones tiles mosaic. During its manufacture 8 mm stone and natural marble tiles are used, all together being fixed on mortar with a metallic structure. Material: Marble Dimensions: 50cm x 50cm View Photos For Further Details.