Check for a karat stamp such as 10K, 14K, 18K, 22K, or 24K
Look for marks like 417, 585, 750, 916, or 999
Use a magnet; real gold is not magnetic
Check for discoloration or fading, especially on clasps and edges
Rub it on unglazed ceramic; real gold will not leave a black streak
Test with a gold testing acid kit
Weigh it and compare it to known gold pieces of similar size
Look for a hallmark from a reputable maker or assay office
Inspect for signs of plating, such as worn spots or a different metal underneath
Have a jeweler test it with an XRF analyzer
Get a professional appraisal or authentication
Check the clasp and solder points for mismatched metal color
Perform a density test if you have the proper tools
Verify the seller’s documentation or certificate if available