Para?ba Tourmaline

Discovered in the late 1980s in the Brazilian state of Para?ba, this is the most valuable tourmaline variety on the market. Its vivid neon or electric blue-green colour is caused by the rare presence of copper (Cu�?) in the crystal lattice. Because natural copper-bearing crystals often carry purplish overtones, they are routinely heat-treated to resolve to the pure neon-blue hues; treatment status is disclosed at the point of sale.

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