Heliodor

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Displaying characteristic yellow to yellowish greens, heliodor is the most cheerful variety of beryl. Interestingly, as an allochromatic gem, pure beryl is colorless, with traces of different elements responsible for beryl's wide range of colors. Heliodor is named from ancient Greek words meaning "gift from the sun," as it was once believed that heliodor harnessed the power and warmth of the sun and was responsible for the change between day and night.

Heliodor Rough
Heliodor Classification
Common Name Heliodor
Species Beryl
Heliodor Optical Properties
Transparency Transparent - Translucent
Dispersion Strength: Weak Fire Value: 0.014
Refractive Index 1.577-1.583
Tolerance:(+0.017/-0.017)
Birefringence 0.005-0.009
Optic Character Uniaxial
Optic Sign Negative
Polariscope Reaction Doubly Refractive (DR)
Fluorescence SWUV: Inert
LWUV: Inert
Pleochroism Dichroic, weak to moderate, varying shades of body color
Heliodor Characteristic Physical Properties
Hardness 7.5
Streak White
Specific Gravity 2.670-2.900 Range:0.18/-0.05 Typical:2.720
Toughness Good
Inclusions Heliodor is a type I clarity stone but sometimes contains tubular, liquid or planes of small two-phase inclusions.
Luster Vitreous
Stability Good
Fracture Conchoidal
Cleavage Poor, in one direction
Heliodor Chemistry & Crystallography
Chemical Name beryllium aluminum silicate
Chemical Formula Be3Al2(SiO3)6
Crystal System Hexagonal
Chemistry Classification Silicate

Heliodor Colors

  • Green Heliodor Green
  • Yellow Heliodor Yellow

Alternate Names

Golden Beryl

Countries of Origin

Tanzania, United Republic Of; Afghanistan; Mozambique; Pakistan; Unknown; Namibia; Ukraine; Brazil; South Africa; Madagascar

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Creation Classification

Lab Created

Hydrothermally grown synthetic heliodor gems crystallize slowly out of a solution (a mix of water and dissolved elements) that has been exposed to heat and pressure similar to the conditions on Earth under which the natural gem mineral grows.Synthetic gems have the same chemical, optical, and physical properties of their natural counterparts, but are a more cost-effective alternative to a natural gem.

Lab Created Heliodor
Lab Created Classification
Common Name Lab Created
Lab Created Characteristic Physical properties
Inclusions Synthetic heliodor is typically eye clean.Due to its synthetic nature chevron, zig-zag or undulating growth zoning is apparent.Liquid and 2-phase inclusions can sometimes be scene along with nailhead spicules.
Tim Matthews

Author

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.