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October has two birthstones: Opal (an amorphous silica with a mesmerizing play of color) and Tourmaline (a boron silicate available in virtually every color). Associated with Libra and Scorpio, opals are believed to enhance creativity and emotional expression. Tourmaline is piezoelectric (it generates electrical charge when heated), and watermelon tourmaline (pink center, green exterior) is especially prized for heart healing.