Look for a hallmark stamp on the jewelry
Check for purity marks such as 24K, 22K, 18K, 14K, or 10K
Look for fineness marks such as 999, 916, 750, 585, or 417
Check for a maker’s mark or manufacturer’s logo
Look for a BIS hallmark if in India
Verify the BIS logo, purity grade, and jeweler’s identification mark
Check for the assay center mark if present
Use a magnifying glass to inspect the stamp clearly
Compare the hallmark with official hallmark standards
Test the item with a gold testing kit if needed
Consult a certified jeweler or assay office for confirmation