Jet, sometimes known as black amber, is not actually an amber. It is fossilized coal. It was used extensively in mourning jewelry in Victorian times and was considered a stone for alleviating and bringing grief to the surface to be healed. It has also historically been used as a protection stone and is said to have very powerful protection energies to ward off evil, negativity, and psychic attacks.
It is also said to protect finances and protect from depression. Jet is related primarily to the base chakra, but when used on the upper chakras it helps kundalini move to the crown chakra. Mystically, jet is considered a stone of sympathy, healing grief, psychic experiences. It is said by intuitive sources to be an excellent calming stone, and helpful for treating epilepsy, migraines, stomach pain, colds, glandular problems, and lymphathic problems.