to prevent death

From the stone history: Tourmaline was known by cenuries by the name schrol. Colored crystals were imported from Sri Lanka at the beginning of the 18th century.

During medieval days tourmaline was thought to heal physical and mental disorders as well as prevent death. Used as a gem for over 2,000 years.

In addition to its use as a gem, tourmaline is employed in pressure devices because of its piezoelectric properties. It has been used in depth-sounding apparatus and other devices that detect and measure variations in pressure.

The colored crystals of tourmaline are very strongly dichroic– i.e., they are of different color when viewed in the direction of different axes. Plates cut parallel to the vertical axis of a tourmaline crystal allow only the extraordinary ray through; if two such plates are placed in crossed position, the light is entirely blocked. A pair of these plates form a very simple polarizing apparatus known as tourmaline tongs.

Healing ability: Tourmaline calms nerves, regulates hormones, fights against genetic disorders. Tourmaline induces a tranquil sleep.

Schorl relieves arthritis pain, helps fighting heart diseases.

Mystical power: Tourmaline is said to dispel fear, negativity and grief.

According to legend, the tourmaline of all colors protects the wearer against many dangers and misfortune.
Rubellite: Is believed to enhance creativity, to increase fertility, to smooth away passive or aggressive nature.
Schorl: release anxiety, raises altruism, deflects negativity, neutralizes distorted energies, i.e. resentment and insecurity.

(dreamy: here)