Look for a sterling silver stamp such as 925, .925, Sterling, or Sterling Silver
Check for other marks such as 800, 900, or 999
Use a magnet; silver is not magnetic
Compare the weight; silver feels relatively heavy for its size
Look for tarnish; silver often develops a dark patina over time
Rub it with a soft white cloth; silver may leave a dark residue
Test with ice; silver conducts heat very quickly
Listen for a ring; silver often makes a clear, high-pitched sound when tapped
Check for discoloration where plating may have worn off
Use a silver testing kit or acid test
Have it tested by a jeweler or appraiser