Tourmaline (often spelled tourmilin) is a crystalline boron silicate mineral group prized in fine jewelry for having one of the widest color ranges of any gemstone species.
Key Characteristics
Color Diversity: Occurs in virtually every hue, including pink, green, blue, yellow, red, black, and multi-colored zones (such as bi-color and "Watermelon" tourmaline).
Hardness: Measures 7 to 7.5 on the Mohs hardness scale, making it durable for daily wear in rings, necklaces, and earrings.
Piezoelectric Properties: Generates an electrical charge when subjected to mechanical pressure or thermal changes (pyroelectric), which historically earned it the name "electric stone."
Popular Trade Varieties
Rubellite: Deep pinkish-red to vivid red tourmaline, often highly valued for its similarity to ruby.
Paraíba: Rare, electric neon-blue to green-blue copper-bearing tourmaline originally discovered in Brazil.
Watermelon Tourmaline: Features a pink/red core surrounded by a green outer layer, mimicking a sliced watermelon.
Verdelite & Indicolite: Trade names for green and blue tourmalines, respectively.
Schorl: Black tourmaline, representing the most common species of tourmaline in nature.
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