Onyx is classified as semiprecious marble. Its quality is higher the more homogeneous its colours. White onyx is the most highly valued since its production is limited and it is very difficult to get hold of. Argenta Cerámica has reproduced this beautiful marble in its purest essence: homogeneity, whiteness and purity are its main characteristics. Selene polished porcelain with a high-shine finish comes in 120×120, 60×120, 60×60 and 30×60 cm formats.