Global Gemology & Appraisals
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Yellow Gold


Mid Century Era vintage 14K gold & diamond brooch
Mid Century Era yellow gold and diamond brooch, with textured finish
Gold is a precious metal that has been cherished for thousands of years, with the first known gold jewelry dating back to 4000 B.C.

​Pure gold has a melting point of 1948˚ Fahrenheit.

Pure gold is very malleable, and is often alloyed with other metals to strengthen it.

Karats are the units used to measure the purity of gold.

24K Gold = Pure Gold
22K Gold = 91.7% Pure
18K Gold = 75% Pure
14K Gold = 58.5% Pure
10K Gold = 41.7% Pure
​9K Gold = 37.5% Pure
 All photos courtesy of Scott Papper, GIA GG, AJP, CMA (NAJA)
  • HOME
  • ABOUT US
  • SHOP
  • GEMOLOGY
    • GEM ENCYCLOPEDIA
    • REFRACTIVE INDEX CHART
    • BIRTHSTONE CHART
    • 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