LAMONT uses natural rock crystal (calcite and fluorite), faux rock crystal and clear leaded crystal. All will shatter if dropped and chip if knocked with hard or sharp materials. All can be cleaned using damp cloths followed by dry soft cloths. Clear leaded crystal (in the case of decanters or water vessels) can be washed in warm soapy water and  polished with specialist glass polishing materials. Do not put into the dishwasher.