Karats and Purity Information
Determining the Value of Marked Jewelry

Determining the value of marked jewelry and other precious metals is a fairly straight forward process.
In addition to the charts below and your jewelry, you will also need:

gold authenticity
Jewelry Scale
  1. A magnifying glass or loupe
  2. A decent light source
  3. A reasonably good scale
    that weights in grams or ounces
gold 14 karat marking
silver purity mark

Gold and Silver Purity Markings

  • Karat Gold
    Mark on Jewelry
  • 9 kt
  • 10 kt
  • 12 kt
  • 14 kt
  • 18 kt
  • 22 kt
  • 24 kt
  • Percentage of
    Pure Gold
  • 37.50%     (9 ÷ 24)
  • 41.67%     (10 ÷ 24)
  • 50.00%     (12 ÷ 24)
  • 58.5%     (14 ÷ 24)
  • 75.00%     (18 ÷ 24)
  • 91.67%     (22 ÷ 24)
  • 99.99%     (24 ÷ 24)
  • European
    Stamping Mark
  • 375
  • 416
  • 500
  • 585
  • 750
  • 917
  • 999
  • Standard
    Stamping
  • 950
  • Sterling
  • 900
  • 835
  • 800
  • Percentage
    Silver
  • 95.0%
  • 92.5%
  • 90.0%
  • 83.5%
  • 80.0%

Determining Precious Metal Values

Gold, Silver and other precious metals are valued by SPOT Value: their market price at a particular point in time. To calculate current metal values, simply multiply the weight of a precious metal item times its purity (from the chart above). Once you have the weight of pure metal, one only needs to convert the weight to Troy ounces. You may find the Weight Conversion Chart below helpful in making weight calculations.

weight precious metal

Weight Conversion Chart
to Determine Precious Metal Values

  • Weight Unit
  • 1 Troy Ounce
  • 20 Pennyweight (DWT)
  • 1 Pennyweight (DWT)
  •   Equivalent Weight  
  •   31.1 Grams  
  •   1 Troy Ounce  
  •   1.555 Grams  

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