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Heliodor

Beryl

By Tim Matthews, JD, FGA, GG, DGA,
CEO and President of JTV (retired)
Published: June 2014
Modified: September 2023
Heliodor Polished Heliodor Rough Heliodor Jewelry
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Table of Contents
  • General Information
  • Heliodor Colors
  • Alternate Names
  • Countries of Origin
  • Care
  • Species/Variety
  • Creation Classification

Displaying characteristic yellow to orangish yellow and greenish yellow, 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.

General Information

  • Classification
  • Optical Properties
  • Characteristic Physical Properties
  • Chemistry & Crystallography
Common Name
Heliodor
Species
Beryl
Transparency
Transparent - Translucent
Dispersion
Strength: Weak Fire Value: 0.014
Refractive Index
1.560-1.602 Tolerance: Typical 1.577
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
Hardness
7.5-8
Streak
White
Specific Gravity
2.630-2.920 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
Chemical Name
beryllium aluminum silicate
Chemical Formula
Be3Al2(SiO6)18
Crystal System
Hexagonal
Chemistry Classification
Silicate

Heliodor Colors

  • Yellow Heliodor
    Yellow
  • Yellow Heliodor
    Yellow
  • Yellow Heliodor
    Yellow
  • Yellow Heliodor
    Yellow

Alternate Names

Golden Beryl

Countries of Origin

Tanzania, United Republic Of; Afghanistan; Russian Federation; Viet Nam; Czechia; United States of America; Madagascar; Portugal; Mongolia; Mozambique; Pakistan; Unknown; China; Brazil; France; Nigeria; Argentina; Sri Lanka; Ukraine; Spain; Canada; Norway; Namibia; Italy; Mexico; South Africa; Zimbabwe; Australia

Care

Normal Care, but some stones may fade in prolonged exposure to light or heat.

Species/Variety

Golden Beryl

Golden beryl can be light yellow to rich golden yellow. Stones are known for their excellent clarity and transparency. The three major sources are Brazil, Madagascar and Namibia.

Golden Beryl Heliodor
Golden Beryl Heliodor
  • Classification
  • Characteristic Physical properties
Common Name
Golden Beryl
Specific Gravity
2.63
Toughness
Good
Stability
Good

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.

  • Classification
  • Characteristic Physical properties
Common Name
Lab Created
Specific Gravity
2.63
Toughness
Good
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.
Stability
Good
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