Global Gemology - Rare Gems & Jewels
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KARAT

Picture
Photo courtesy of Scott Papper, GIA GG, AJP, CM (NAJA), Global Gemology & Appraisals
Karats are units used to measure the fineness of gold.

24K = Pure Gold
18K = 75% Gold
14K = 58.5% Gold
10K = 41.7% Gold
9K = 37.5% Gold

While 14 karat gold is always 58.5% pure gold, its other alloys determine what color the gold will be.  White gold will have a higher percentage of nickel while rose gold will have higher copper content.
  • 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