Earth Stones: although the jewellery is water resistant, it’s not advisable to swim or bath with it. If there is a need to clean the earth stones (dust, etc.): rub gently a ‘needle drop’ of dishwashing liquid over the surface. Rinse with clean water and let it dry on a tissue.
Cleaning copper, brass and silver: squeeze pure lemon juice on a tissue and rub gently. It’s also possible to polish the (precious) metals to add an extra glow (copper-, silver polish, available in every self-respecting hardware shop).