What Is Tourmaline Gemstone | Tourmaline Stone

Tourmaline

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

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BUYER'S GUIDE

Tourmalines not only show every hue of the rainbow, but also an incredible range of color saturations and tones—from expensive electric blues to affordable olive greens.

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COLOR IS THE MOST IMPORTANT QUALITY FACTOR FOR TOURMALINE
With all the amazing colors of tourmaline there is a color for every preference. While highly saturated colors without dark black areas are the most valuable, less saturated “earth” colors have become popular.

Clarity Refers To The Inclusions

Tourmalines often grow in an environment rich in liquids, and some of those liquids are often captured as inclusions during crystal growth. The most typical inclusions resemble thread-like cavities parallel to the length of the crystal. If cut as a cabochon these may cause a cat’s eye effect.

CUT IS ONE OF THE MOST IMPORTANT FACTORS IN APPEARANCE
Rather than cutting every tourmaline lengthwise, many cutters orient a fashioned gem based on its depth of color. To darken pale rough, they orient a gem’s table perpendicular to the crystal’s length. To lighten dark rough, they orient a gem’s table parallel to the crystal’s length.

Carat Weight Allows For Precise Measurements

Fashioned tourmalines in larger sizes rise considerably in per-carat price. Even though specimens can reach spectacular sizes, these are rare. Availability drops and prices rise sharply for facet-quality rough material.

TOURMALINE QUALITY FACTORS: THE COMPREHENSIVE GUIDE

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TIPS & ADVICE

1. There’s a tourmaline in your favorite color.
Tourmalines in bright and muted colors span the spectrum. This gem is also perfect for those who like color combinations, with bicolor and tricolor gems that are cut to show both colors.

2. Find a jeweler who can show you a variety of tourmaline.
Jewelers who know and love gemstones have a range of tourmaline colors available to show you.

3. Don’t compromise on cut.
The quality of the cut can make a big difference in beauty and brilliance. Your tourmaline should sparkle in a lively way, reflecting light back evenly across the entire gem. Poorly cut gems are much less marketable and sell at a discount.

4. Tourmalines present extra challenges in store displays.
Tourmaline’s unusual electrical “pyroelectric” property means when it heats up under the lights of display cases, it gains a slight charge, attracting extra dust.

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QUESTIONS & ANSWERS

Q
WHAT TOURMALINE COLOR IS BEST?
A
Bright, pure tones of red, blue and green are generally the most valued, but the electric vivid green to blue shades of copper-bearing tourmaline are so exceptional that they are in a class by themselves.
Q
IS TOURMALINE FROM PARAÍBA WORTH MORE?
A
Every mine produces a wide range of quality. The fact that a tourmaline comes from a famous mine doesn’t mean it is good quality. But fine-quality tourmalines that have documentation of their Paraíba origin from an independent laboratory like GIA command a premium.
Q
HOW DO I KNOW IF MY TOURMALINE IS FROM PARAÍBA?
A
GIA tourmaline reports include an opinion on geographic origin when it is possible to establish.
Q
DOES GIA GRADE TOURMALINE?
A
GIA evaluates tourmaline but does not grade it. A GIA Colored Stone Identification Report assesses the characteristics of any polished, rough, mounted or loose material (weight, measurements, shape, cutting style and color); identifies whether it is natural or laboratory-grown; and names any detectable treatments. Paraíba tourmaline can be submitted for a Colored Stone Identification & Origin Report.