Paraíba tourmaline

Paraíba tourmaline is neon blue, greenish blue or green elbaite tourmaline that owes its colour mainly to copper (and manganese). It was first found in the 1980s at a small mine in the Brazilian state of Paraíba and reached the international market in 1989; its “neon” or “electric” colours had never been seen in tourmaline before. It was later found in Nigeria, Mozambique and, in 2026, Ethiopia. Laboratories give the name to copper-bearing tourmalines of these colours whatever their origin.

Jewellery: Its neon colour makes it a centre stone for rings, pendants and earrings. Its hardness (7–7.5) suits everyday jewellery; because of liquid inclusions, ultrasonic and steam cleaning are not recommended. Collecting: Crystals from the Batalha mine and large, clean cut stones are sought by collectors. Gemmology: Determining a stone's origin in the laboratory from trace elements (copper, zinc, gallium, strontium, lead) is one of the key examples of origin determination in gemmology.

It has a hardness of 7–7.5 on the Mohs scale. It scratches glass and steel; a steel knife cannot scratch it. Its specific gravity is 2.84–3.1 g/cm³.

Its best-known localities: Batalha mine, São José da Batalha (Salgadinho), Paraíba, Brazil; Mavuco (Chalaua), Alto Ligonha pegmatite district, Nampula, Mozambique; Rio Grande do Norte State, Brazil; Nigeria; Ethiopia.

Its colour is a neon-bright blue, greenish blue, turquoise or mint green; Mozambique also produces pink and purple stones. Its hardness is 7–7.5, its refractive index about 1.603–1.655 and its specific gravity about 2.84–3.10; these values identify it as tourmaline. Most stones contain inclusions; the most common are partially healed fractures. Heat treatment: most Paraíba tourmalines are heated; heating removes the purple-pink component caused by manganese and turns the stone blue or green. Heat treatment is hard to detect with standard tests.

On the “street to diamond” value ladder it sits on step 7 of nine: Precious stone. In Paraíba tourmaline colour matters far more than clarity: a medium-toned, highly saturated blue with neon brightness is the most sought after, while green and pale stones are worth less. Inclusions are normal and matter little when the colour is strong, but fracture filling lowers value considerably. Stones from Brazil are valued much more highly than African ones, so a laboratory report stating origin matters. Heat treatment is common; large, clean stones are rare.

Today crystal-therapy websites and stone sellers claim that Paraíba tourmaline is linked to the heart chakra, clears the mind and eases difficult decisions, strengthens intuition, calms the body and supports the immune system. There is no scientific evidence that Paraíba tourmaline clears the mind, strengthens intuition or supports immunity. Because the stone only became known in the late 1980s, these claims come not from an old tradition but from recent crystal-therapy thinking; its neon colour is due to copper in the crystal. This section reports beliefs; it is not health information. There is no scientific evidence for these claims and no stone replaces medical treatment.