Check for hallmarks or stamps like 10K, 14K, 18K, 22K, 24K
Use a strong magnet to see if the item is attracted
Rub the item on unglazed ceramic and inspect the streak
Test with vinegar and watch for discoloration
Apply a drop of nitric acid on a hidden spot if available
Compare the item’s weight and feel to known gold pieces
Look for tarnish, rust, or fading on worn areas
Try a skin test for green or black marks after wearing
Use a gold testing kit with acid and test stone
Check density by measuring weight and water displacement
Inspect edges and clasps for base metal showing through
Take it to a jeweler for professional verification