Tourmaline (pronounced a "tur-mah-Leen") is a semi-precious gemstone which is
a crystal boron silicate mineral compounded with elements such as aluminium, iron, magnesium, sodium, lithium,
or potassium. It occurs in a rainbow of colors, somtimes even within the same gemstone. Black tourmaline
also exists and is sometimes used by those who believe in the healing properties of certain gemstones.
While not always necessary, some tourmaline gems, particularly those pink to red colored stones, are heat
treated to improve their color. The use of Irradiation treatments is almost impossible to detect in
tourmalines, but insn't harmful to their value. Treated clarity-enhanced tourmaline (especially paraiba)
is worth a lot less than a non-treated gemstones.
Touramaline Crystals of Different Colors
Black Touramaline Crystals
Cut Touramaline Gemstones
Color: Colorless, pink, red, brown, yellow, green, blue, violet, black, multi-colored
Mohs' Hardness Scale: 7 to 7.5
Density: 2.82 to 3.32
Transparency: Transparent to opaque