Global Gemology - Rare Gems & Jewels
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HELIODOR

Picture
Custom made helidor & emerald 3-stone beryl ring in 18K gold
Heliodor and emerald three stone ring
Variety:  Heliodor
Species:  Beryl
​​Mohs Hardness:  7.5 to 8 out of 10
Color:  Slightly greenish yellow to orangy yellow, generally light in tone.
RI:  1.577 to 1.583 (+/- 0.017)
Birefringence:  0.005 to 0.009
SR/DR/AGG:  DR
Clarity Type:  Type I
Optic Character:  Uniaxial negative
Pleochroism:  Weak greenish yellow and yellow, or 2 tones of the stone's bodycolor
Spectrum:  Not diagnostic
Fluorescence:  Inert
SG:  2.72 (+ 0.18 / -0.05)
Routine Treatments:  None
Additional Enhancements:  Heating, irraditation

Helidor Facts

Picture
Fantasy cut Heliodor golden beryl set in a handmade sterling silver nugget pendant
Fantasy cut heliodor in a handmade silver pendant

Heliodor is the yellow variety of beryl.

It ranges from slightly greenish yellow to slightly orangey yellow.

Heliodor is also referred to as "yellow beryl" or "golden beryl".


All photos courtesy of Scott Papper, GIA GG, AJP, CMA (NAJA)

  • HOME
  • ABOUT
  • SHOP
  • SERVICES
    • APPRAISALS
    • EXPERT WITNESS TESTIMONY
    • SELL YOUR JEWELRY
  • GEMOLOGY
    • GEM ENCYCLOPEDIA
    • THE ART OF GEMOLOGY
  • JEWELRY EDUCATION
    • DIAMOND FACTS
    • JEWELER DIRECTORY
    • JEWELRY PERIODS
    • POCKET WATCHES
    • NATIVE AMERICAN JEWELRY
  • GLOSSARY