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Ruby in zoisite is a translucent to opaque rock composed of ruby crystals, green zoisite and black hornblende. The official name for this gem is "anyolite," from the Masai word anyoli, meaning "green." This gem is usually used as an ornamental stone due to its stunning color contrasts.

Ruby-Zoisite Polished
Ruby-Zoisite Classification
Common Name Ruby-Zoisite
Species Rock
Ruby-Zoisite Optical Properties
Transparency Translucent - Opaque
Dispersion Strength: None
Refractive Index 1.700-1.770 Tolerance: Red areas 1.760-1.770 Green 1.700
Optic Character NA
Optic Sign NA
Polariscope Reaction Aggregate (AGG)
Fluorescence SWUV: Inert
LWUV: Inert
Pleochroism None
Ruby-Zoisite Characteristic Physical Properties
Hardness 6-9
Specific Gravity 3.100-3.400
Inclusions Ruby areas might show hexagonal outline.
Luster Vitreous, Pearly
Fracture Uneven
Cleavage None
Ruby-Zoisite Chemistry & Crystallography
Chemical Name aluminum oxide and calcium aluminum silicate hydroxide
Chemical Formula Al2O3 and Ca2Al3(SiO4)3(OH)
Crystal System NA
Chemistry Classification Rock

Ruby-Zoisite Colors

  • Bi-color Ruby-Zoisite Bi-color
  • Red Ruby-Zoisite Red
  • Multi-color Ruby-Zoisite Multi-color
  • Green Ruby-Zoisite Green

Alternate Names


Countries of Origin

Tanzania, United Republic Of; Unknown

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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.