Tourmaline

Tourmalines have a wide variety of exciting colors with one of the widest color ranges of any gem.

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BIRTHSTONES &
ANNIVERSARIES

Tourmaline is a birthstone for October, along with opal. Tourmaline is also the gem of the eighth anniversary.

 

ABOUT TOURMALINE

Tourmaline’s colors have many different causes. It’s generally agreed that traces of iron, and possibly titanium, induce green and blue colors. Manganese produces reds and pinks, and possibly yellows. Some pink and yellow tourmalines might owe their hues to color centers caused by radiation, which can be natural or laboratory-induced.


WHY WE LOVE THIS GEMSTONE

1554

Francisco Spinoza’s expedition discovers “Brazilian emerald”:
the first recorded green tourmaline crystal.

PYROELECTRIC

Tourmaline becomes electrically charged when heated.
Also when squeezed: it’s piezoelectric too.

PARAIBA

Brazilian source famous for vivid blue to
green tourmalines colored by copper.

TRIGONAL SYSTEM

Tourmaline crystallizes in the trigonal system; 
no other common mineral has three-sided prisms.

WATERMELON VARIETY

Watermelon tourmaline is green on the outside
and a delicious pink on the inside.

LIDDICOATITE

Liddicoatite tourmaline was named for beloved
former GIA President Richard T. Liddicoat.


QUALITY FACTORS

Tourmaline’s varieties have a wide range of quality factors considerations.

CUT Tourmaline crystals are often long, leading cutters to cut slender finished stones.

CUT
Tourmaline crystals are often long, leading
cutters to cut slender finished stones.

COLOR Tourmaline's rainbow colors have a wide range of color intensity and tone.

COLOR
Tourmaline's rainbow colors have
a wide range of color intensity and tone.

CLARITY Pink to red tourmaline often has more visible inclusions than green to blue varieties.

CLARITY
Pink to red tourmaline often has more visible inclusions than green to blue varieties.

CARAT WEIGHT Tourmalines come in all shapes and sizes. The value change for size varies with the variety.

CARAT WEIGHT
Tourmalines come in all shapes and sizes. The value change for size varies with the variety.