"Paraiba moonstone" isn't a single gemstone; it usually refers to combining the rare, vibrant blue-green Paraiba Tourmaline, known for its copper-induced neon glow, with iridescent Moonstone, creating jewellery with striking color contrast and a mystical, shimmering effect. The term highlights the electrifying blue of Paraiba Tourmaline against the soft, milky flash (adularescence) of moonstone, resulting in unique, often exotic-looking pieces.