Decoding Jewelry Hallmarks: Your Guide to Authenticity Marks
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What Are Jewelry Hallmarks?
Hallmarks are official marks stamped on precious metal jewelry to certify its authenticity, purity, and origin. Understanding these tiny symbols helps you verify the quality and value of your jewelry pieces.
Common Hallmark Symbols
Purity Marks for Gold
- 24K or 999: Pure gold (99.9%)
- 22K or 916: 91.6% gold
- 18K or 750: 75% gold
- 14K or 585: 58.5% gold
- 10K or 417: 41.7% gold
Silver Hallmarks
- 925: Sterling silver (92.5% pure silver)
- 958: Britannia silver (95.8% pure silver)
- 800: European silver standard
Platinum Marks
- 950: 95% platinum
- 900: 90% platinum
- PLAT or PT: Platinum designation
Additional Hallmark Information
Maker's Mark
A unique symbol or initials identifying the manufacturer or designer. This mark helps trace the jewelry's origin and can add value to collectible pieces.
Date Letter
Some countries use date letters to indicate the year of manufacture, particularly valuable for antique jewelry authentication.
Assay Office Mark
Indicates which official assay office tested and certified the metal purity. Common in UK and European jewelry.
Where to Find Hallmarks
- Rings: Inside the band
- Bracelets: On the clasp or inner surface
- Necklaces: Near the clasp or on a small tag
- Earrings: On the post or back
Verifying Authenticity
Use a jeweler's loupe or magnifying glass to read hallmarks clearly. If purchasing valuable pieces, consider having them authenticated by a certified gemologist or appraiser.
International Variations
Different countries have different hallmarking systems. European jewelry often uses numerical purity marks (750, 585), while American jewelry typically uses karat marks (18K, 14K).
Red Flags
Be cautious if jewelry lacks hallmarks entirely, has unclear or poorly stamped marks, or if the marks don't match the seller's description. Always purchase from reputable jewelers who can verify authenticity.