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Amethyst is one of the most popular metaphysical stones. Leonardo Da Vinci wrote that amethyst has the power to dissipate evil thoughts and quicken intelligence. Amethyst is a great stone to use if you are trying to increase your psychic abilities and enhance your intuition. Amethyst has been a symbol of peace, purity, and unification and can aid in bringing serenity and calmness. Use amethyst to treat insomnia and promote peaceful and healing sleep. It is also commonly used to relieve headaches, sugar imbalances, and general edginess, bringing an overall sense of spiritual balance.