Decoding Hallmarks: How to Read Metal Stamps and Identify Authentic Jewellery

That gold, silver, or platinum that has been in your jewellery box for years — do you own its value? They are signs and signals, the universal language of integrity. Between these small metal stamps, you can learn everything: purity, metal type (platinum or gold), origin (France or Italy), certification , and sometimes even the year or maker’s mark. Know your hallmarks to spot genuine jewellery and avoid fakes with confidence.

What Are Hallmarks on Jewellery and Why Do They Count?

What are the hallmarks of gold jewellery? They act as a shield to prevent buyers from being tricked and to ensure transparency in the jewellery market globally. The BIS affixes such marks in India, the London Assay Office and the US Jewellers Vigilance Committee.

A hallmark typically includes:

Manufacturer’s symbol

Quality of the metal (e.g., 916, 925, 750)

Metal type (gold, silver, platinum)

Assay office or certifying body

Year or identification mark

Demystifying Gold Hallmarks: How to Decipher the Digits

Gold jewellery is made of gold and other alloys. Hallmarks allow you to determine the precise purity.

Common Gold Purity Hallmarks

BIS Hallmarking in India
The BIS hallmark consists of three compulsory marks:

• Purity mark (e.g., 916)
  
• BIS logo
  
• HUID – 6-digit code introduced in 2021 to track original jewellery pieces

This way, you can trace and verify each piece.

Silver Hallmarks: What the Marks Tell You

Silver is frequently alloyed with other metals to achieve greater toughness. The most widely used stamp is 925, which refers to sterling silver.

Key Silver Hallmarks

• 925 = 92.5% pure silver
  
• 958 = Good Britannia silver (a higher grade than the standard 925 for sterling silver)
  
• 900 / 800 = Silver used in utensils and antiques

On the bottom, it might also bear a lion (UK), crescent moon (Germany) or maker’s mark.

Platinum Stamps: The Most Precious Metal with the Boldest Markings

There are a few things to look out for when you see a hallmark to ensure you do not mistakenly purchase it as solid platinum when it is not.

Platinum Purity Marks

• 950 = 95% of the alloy is platinum (the most typical)
  
• 900 = 90% pure platinum

All platinum jewellery sold in India has to be stamped with the Pt mark, purity number and jeweller’s code.

Maker’s marks and Assay office symbols – How to identify them

In addition to purity, jewellery includes:

1. Maker’s Mark
   A special mark or initial of the jeweller.
   Example: “T&Co.” for Tiffany & Co.
   
2. Assay Office Mark
   Programmes in which the jewellery was tested and hallmarked.
   Examples:
   • Leopard’s head — London Assay Office
     
   • Anchor — Birmingham
     
   • BIS logo — India

These symbols authenticate that the lot meets specific purity criteria.

How to Identify Fake or Misleading Hallmarks on jewellery

Counterfeit jewellery often carries:

• Incorrect number sequences
  
• Poorly stamped or uneven marks
  
• Hallmarks placed in unusual areas
  
• Fake BIS/HUID tags
  
• Missing certifying body symbols

A true hallmark is evident, specific, and can be tracked.

If you ever doubt, you can check:

Seller’s certification and invoice details

BIS HUID on the BIS Care App

Purity at a testing centre licensed by the BIS

Hallmarks On Antique And Vintage Jewellery

Older jewellery may have:

• Hand-engraved hallmarks
  
• Country-specific vintage symbols
  
• Old purity standards

Such signatures are essential indicators for both appraisers and collectors, as they may dramatically increase the value of the jewel.

Why Hallmarks Are So Important To Buyers, Sellers And Investors

Understanding hallmarks helps you:

• Confirm authenticity
  
• Assess fair pricing
  
• Trace origin
  
• Authenticate vintage or heirloom pieces
  
• Make smarter investment decisions

Authentic hallmarked jewellery does more than just save you money; it builds strong trust with buyers and collectors over time.

Final Thoughts

Hallmarks are the jewellery world’s secret truth-tellers. As a collector, buyer, seller, or enthusiast, they are how you will be able to confidently and clearly select genuine jewellery. The next time you try to accessorise with a gold bangle or silver ring, ignore them—the little stamp could spell disaster for your health.

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