1. Silver Purity Standards: 999 Fine vs 925 Sterling
When buying physical silver in India, the most critical factor is fineness. Pure silver is soft and malleable, so jewelers blend it with base metals like copper depending on the end-use product:
999 Fine Silver (99.9% Pure)
Standard purity for minted bullion bars (100g, 500g, 1kg) and investment coins. Contains zero copper alloy, offering maximum resale purity.
925 Sterling Silver (92.5% Pure)
Standard grade for silver jewelry, silverware, thalis, and decorative idols. Blended with 7.5% copper to prevent bending and surface scratching.
2. 4 DIY Tests to Spot Fake Silver at Home
Before buying unhallmarked silver coins or heirloom items, perform these four simple, non-destructive home tests:
1. The Rare-Earth Magnet Test
Silver is non-magnetic. Hold a strong neodymium magnet near the silver item. If it strongly snaps to the magnet, it is made of iron or nickel plating.
2. The Ice Thermal Melt Test
Silver has the highest thermal conductivity of any metal. Place an ice cube directly on a silver coin at room temperature. The ice will instantly start melting as if placed on a hot skillet.
3. The High-Pitch Ping Sound Test
Gently tap your silver coin with another metal object. Genuine 999 silver emits a clear, high-pitched bell ring that resonates for 1-2 seconds, unlike base metals which produce a dull thud.
4. The Bleach Chemical Reaction Test
Place a micro-drop of household bleach on an unexposed corner of the item. Real silver will instantly oxidize, creating a dark black spot (silver sulfide) that can easily be polished off.
3. BIS HUID Hallmarking & Invoice Verification
The Bureau of Indian Standards (BIS) enforces mandatory 3-mark hallmarking for silver articles sold by registered jewelers in India:
- BIS Triangular Logo: Official mark of national testing accreditation.
- Purity Mark: Stamped as 999 for bullion bars or 925 for sterling articles.
- 6-Digit Alphanumeric HUID: Unique Hallmark Unique Identification code traceable in the BIS CARE mobile app.