In India, buying gold is not just a fashion statement; it is a vital ancestral investment. Checking the BIS (Bureau of Indian Standards) Hallmark is legally and financially critical. Since 2021, the government has mandated a six-digit alphanumeric HUID (Hallmark Unique Identification) code to make every piece traceable. When you inspect a hallmarked gold piece through a jewellers loupe, look for three distinct laser marks: 1. The BIS Logo: A triangular emblem symbolizing national standard certification. 2. The Purity Code: For 22-karat gold, you will see 22K916 (representing 91.6% pure gold). For 18-karat gold, it will read 18K750 (75% pure gold). 3. The HUID Code: A unique alphanumeric string etched onto the inner band, which can be instantly verified in the governments BIS Care App. Santosh Kumar Sarraf & Son was one of the first jewellers in Hapur to introduce BIS Hallmarking, years before it became mandatory nationwide, and maintains fully hallmarked inventory today.