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Paraíba tourmalines are a rare, precious gemstone variety known for their intense blue, green, or bluish green colors. The name comes from the Brazilian state of Paraíba, where they were first discovered.

Color:

• Paraíba tourmalines are known for their vivid, saturated blue to green-blue colors.

• The color is often described as "electric" or "neon".

• The color is caused by copper and manganese in the stone.

Other characteristics:

• Paraíba tourmalines are a type of elbaite tourmaline.

• They have a refractive index of 1.603 to 1.655 and a specific gravity of 2.84 to 3.10.

• They have a high birefringence of 0.013 to 0.024.

• They are considered one of the world's most prized gemstones.

Heat treatment:

• Heat treatment can modify the colors of Paraíba tourmalines.

• A pink halo around tube-like inclusions, called “pink sleeves,” can be evidence of an unheated stone