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October Birthstone

Indicolite is one of the most valuable and collectible of all elbaite tourmalines, with hues spanning from lighter to deep, intense blues. Cutting indicolite can be a task for even the most skilled of cutters, as it is strongly pleochroic and appears darker when viewed down the crystal. This factor must be taken into consideration when cutting, as a loss of transparency and brilliance can occur in darker specimens.

Indicolite Polished
Indicolite Classification
Common Name Indicolite
Species Tourmaline
Indicolite Optical Properties
Transparency Opaque-Transparent
Dispersion Strength: Moderate Fire Value: 0.017
Refractive Index 1.615-1.665 Tolerance: (+0.011/-0.009)
Birefringence 0.018- 0.020
Optic Character Uniaxial
Optic Sign Negative
Polariscope Reaction Doubly Refractive (DR)
Fluorescence SWUV: Inert to weak bluish green
LWUV: Inert to weak bluish green
Pleochroism Dichroic, strong dark blue and light blue
Indicolite Characteristic Physical Properties
Hardness 7-7.5
Streak White
Specific Gravity 2.90-3.10 Range:0.2/-0.06 Typical:3.060
Toughness Fair
Inclusions Indicolite is a type II clarity. stone. Stones might contain liquid and gas inclusions that are long and thin, reflective gas-filled fractures and color zoning.
Luster Vitreous
Stability Very Good
Fracture Conchoidal
Cleavage Poor, in two directions
Indicolite Chemistry & Crystallography
Chemical Name complex boro-silicate of Al, Mg and Fe
Chemical Formula Na(Li,Al)1.5Al6(Si6O18)(BO3)3(OH)3(OH)
Crystal System Trigonal
Chemistry Classification Silicate

Indicolite Colors

  • Blue Indicolite Blue

Alternate Names

Indigolite, Aqualite

Countries of Origin

Afghanistan; Mozambique; Pakistan; United States of America (the); Unknown; Sri Lanka; Namibia; Brazil; Madagascar; Nigeria


Untreated stones just need normal care. Oiled or resin infused stones avoid steaming, harsh chemicals, ultrasonic, and temperature changes.

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Tim Matthews


Tim Matthews

Tim Matthews is President and Chief Executive Officer of Jewelry Television® (JTV), as well as a member of the company's Board of Directors. He oversees and leads all aspects of the company's powerful omni-digital retail platform that uniquely specializes in fine jewelry and gemstones. His passion for business and gemstones has led him to become a recognized expert in the field of gemology. He is a life member of the Gemmological Association of Great Britain (Gem-A) and has earned Gem-A's highest degrees, the Gemmology (FGA) and Diamond (DGA) diplomas. He is also a Graduate Gemologist (GG) of the Gemological Institute of America (GIA) and has also completed GIA's Graduate Diplomas in Diamonds, Colored Stones and Pearls. Under his leadership, JTV has become the leader in the sourcing and selling of color gemstones and jewelry.

This page was created on June 27, 2014.

This page was last edited on October 24, 2019.