Purple Stones which are purple or indigo-coloured are receptive and spiritual. Ruled by Jupiter and Neptune, they have long been associated with mysticism and purification. These are excellent stones to wear for meditation, psychic work or during any ritual designed to contact the subconscious mind. As with green and blue stones, purple is the colour of healing and peace. These stones are worn to maintain health and are sometimes given to unruly children to promote obedience. Physically, purple stones are utilized to relieve complaints in the head such as headache, mental illness, concussion and hair problems. They relieve depression and produce restful sleep when worn at night. Purple stones are associated with organized religion as well as the more spontaneous, Earth-oriented systems. They are worn to contact higher forces.
[Encyclopedia of Crystal, Gem, and Metal Magic-Scott Cunningham]