All pieces are finished by hand, generally to a hone or polish. We are adamant about health and environmental concerns, therefore no chemical polishes or sealers are used on any piece. What you get is 100% natural stone. However, as all stones are porous, staining can occur if they come into contact with ink, dyes, liquids and oils, including repeated contact with human skin. Many people prefer to let their stone age naturally and acquire a lustrous “patina” from touch and use. If you prefer to seal the stone, however, there are safe oils and compounds which we can recommend you apply, though some may alter the tone of your piece.