A natural piece of black tourmaline is pre-drilled with a hole to accommodate wire or chain for a customized design. Pricing ranges for this item based on size and quality.
Since black tourmaline is pleochroic, it might also be green when viewed along a different axis. This crystal is also piezoelectric which means that through mechanical action an electric pulse is formed, similar to quartz.
As a healing stone tourmaline is sought after as a talisman of protection to deflect and counteract negative energies. It is also used to guard against radiation and environmental pollutants.