Global Gemology - Rare Gems & Jewels
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SPECTRUM

Picture
This colorful image shows a dark band at the 650 mark, indicating this piece of jadeite jade has been dyed.
Photo courtesy of Scott Papper, GIA GG, AJP, CMA (NAJA), Global Gemology & Appraisals

A gemstone's absorption spectrum describes the specific bands of light that are absorbed by the gem, and the bands that pass through it.

Gemologists will sometimes use a spectroscope to measure a gem's absorption spectrum, to help with gem identification.
  • 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