Jet is a rare organic gem created by a combination of biological and geological processes. Originally an evergreen tree that lived millions of years ago, that decomposed under high pressures. While Petrified Wood crystalizes, Jet does not. Instead, it becomes a mineraloid, a mineral-like substance, but not an actual mineral. Jet is a type of coal.
According to metaphysical beliefs, jet can help the wearer to break negative behavioral patterns. Jet has also been used as a stone of good luck and one that brings clarity during trials and tribulations.