How to Read and Verify Gold Purity Marks

Gold jewelry is cherished not only for its beauty but also for its value, which is largely determined by purity. To protect buyers and ensure authenticity, gold items are stamped with purity marks. Learning how to read and verify these marks is essential for anyone purchasing gold, whether as an investment or for adornment.

What Are Gold Purity Marks?

Gold purity marks are small engraved symbols or numbers on jewelry that indicate the amount of pure gold in the piece. These marks provide transparency and help buyers understand the karat value or fineness of the gold.

Examples of Common Marks:

• 24K or 999: Pure gold (99.9% gold)

• 22K or 916: 91.6% gold

• 18K or 750: 75% gold

• 14K or 585: 58.5% gold

These stamps are usually found on the inner surface of rings, bangles, necklaces, or pendants.

How to Read Gold Purity Marks

1. Look for Karat Numbers (K):
   The karat system measures purity out of 24 parts. For example, 18K gold means 18 parts gold and 6 parts other metals.

2. Look for Fineness Numbers:
   Many countries use a three-digit fineness system. For example, a mark of 750 corresponds to 18K gold, meaning 75% pure gold.

3. Check for Hallmarks:
   Hallmarks are official stamps certified by government agencies or authorized assaying centers. They often include:

   • The purity mark

   • A manufacturer’s or jeweler’s mark

   • The assaying authority symbol

How to Verify Gold Purity Marks

1. Visual Inspection:
   Examine the stamp using a magnifying glass. Fakes may have blurred, inconsistent, or missing marks.

2. Use a Magnet Test:
   Pure gold is non-magnetic. If the jewelry is attracted to a magnet, it may contain other metals.

3. Acid Test:
   A jeweler can apply nitric acid to a small scratch to confirm purity. Different acid solutions react with 24K, 22K, 18K, or 14K gold differently.

4. Electronic Gold Tester:
   Modern devices measure electrical conductivity to verify karat levels accurately.

5. Weight and Density Check:
   Because gold has a high density (~19.3 g/cm³), experienced jewelers can estimate purity based on weight and size.

Tips for Buyers

• Always buy from reputable jewelers who provide certified hallmarks.

• Be cautious of jewelry with missing, fake, or inconsistent stamps.

• Remember that higher-karat gold is softer, while lower-karat gold may be more durable for daily wear.

• Consider getting independent testing for high-value purchases.

Conclusion

Gold purity marks are your guide to understanding the quality and authenticity of gold jewelry. By knowing how to read and verify these marks, you can make informed decisions, avoid counterfeits, and invest confidently in gold that is both beautiful and genuine. Proper knowledge ensures that your jewelry holds its value and shines for generations.