Global Gemology - Rare Gems & Jewels
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glass


Glass
1940s yellow gold and platinum ring set with diamonds and red glass
Species:  Glass
​​Mohs Hardness:  5.5 out of 10
Color:  Glass occurs in all colors, including colorless.
RI:  Usually between 1.470 & 1.700, but can go OTL
Birefringence:  None
SR/DR/AGG:  SR, commonly with ADR
Pleochroism:  None
Spectrum:  Not diagnostic
Fluorescence:  Variable, not diagnostic
SG:  Usually between 2.30 and 4.50

glass facts

Green plique-à-jour stained glass panels in this butterfly brooch
Costume butterfly brooch set with glass

Glass occurs in all colors, and is commonly used as an imitation for many gems.

​Glass will have gas bubbles and/or flow marks when magnified.


Goldstone is a variety of glass with a glittery appearance caused by a phenomena known as aventurescence.
​

Glass Jewelry Gallery

All photos courtesy of Scott Papper, GIA GG, AJP, CMA (NAJA)
  • HOME
  • ABOUT US
  • SHOP
  • GEMOLOGY
    • GEM ENCYCLOPEDIA
    • DECORATIVE PRINTS
    • THE ART OF GEMOLOGY
  • APPRAISALS
    • INSURANCE
    • DIVORCE
    • ESTATE TAX
    • ESTATE DISTRIBUTION
    • CHARITABLE DONATION
    • LIQUIDATION
    • APPRAISALS THRU EMAIL
  • SELL YOUR JEWELRY
  • JEWELRY EDUCATION
    • DIAMOND FACTS
    • JEWELER DIRECTORY
    • JEWELRY PERIODS
    • POCKET WATCHES
    • NATIVE AMERICAN JEWELRY
  • GLOSSARY