Crystals and gemstones take on vibrations of people they come in contact with and can absorb static energies from the environment. It is therefore recommended to cleanse and re-energise stones and gem jewellery from time to time.
A stone that has been used in a crystal healing needs be cleansed immediately after.
Water soluble stones and most jewellery should not be cleansed in water or with salt and some brightly coloured stones should avoid direct sunlight.
These are best cleansed by resting them overnight on an amethyst- or clear quartz cluster, or on a bed of Hematite pebbles. A clearing can also be performed by using the healing sound vibration of a singing bowl or tibetan ting-sha.