Look for a hallmark or karat stamp such as 10K, 14K, 18K, 22K, or 24K
Use a magnet to check if the item is strongly attracted
Rub the item on unglazed ceramic and inspect the streak
Compare the item’s color and wear for signs of fading or tarnish
Test the item’s density by weighing it and checking its size
Use a gold testing acid kit
Use a gold testing stone with acid
Check for discoloration where the item is worn or scratched
Test with a jeweler’s loupe for markings and craftsmanship
Compare the item with known real gold of the same karat
Bring it to a jeweler for professional testing