Amethyst is the most highly valued member of the Quartz mineral family,and it has Purple hues that vary from very pale to dark. The medium-dark to dark tones are considered the most desirable and of course are quite a bit more expensive than the lighter tones. The finest gems usually come from the Elahara mines in Sri Lanka, and the Pau d'Arco mines in Brazil. Amethyst is said to bring serenity and calm, and to enhance one's ability to assimilate new ideas. It is also said to give strength and mental stability, and to provide balance between one's physical, emotional, and intelectual states.