Jewelry Stamp Meanings (925, 750, 585, 417 and More Explained)
If you have ever looked closely at a piece of jewelry, you may have noticed small numbers or letters stamped into the metal. These markings indicate the purity of the metal and help identify whether jewelry is made from gold, silver, platinum, or other metals.
Because many people inherit jewelry or purchase pieces secondhand, understanding these markings can help determine whether the item contains real precious metals.
In this guide, we will explain the most common jewelry stamp meanings and how they relate to metal purity.
What Are Jewelry Stamps?
Jewelry stamps, also called hallmarks, are small markings that indicate the purity or composition of the metal used to make the jewelry.
These stamps are typically found in discreet locations such as:
Inside ring bands
On necklace clasps
On bracelet links
On the back of pendants
Because these markings are very small, jewelers often use magnifiers to read them clearly.
View jeweler magnifiers here:
Jewelry Loupes & Jewelers Magnifiers | Gemstone Inspection | GTE – GOLD TESTING EQUIPMENT
Common Gold Stamp Meanings
Gold jewelry is commonly stamped with either karat markings or numeric purity markings.
These numbers represent the percentage of pure gold contained in the metal.
417 = 10K gold (41.7% pure gold)
585 = 14K gold (58.5% pure gold)
750 = 18K gold (75% pure gold)
916 = 22K gold (91.6% pure gold)
999 = 24K gold (99.9% pure gold)
Higher numbers indicate a higher percentage of pure gold.
Common Silver Stamp Meanings
Silver jewelry is usually marked using purity numbers that indicate the percentage of silver in the metal.
925 = Sterling silver (92.5% pure silver)
900 = Coin silver (90% pure silver)
999 = Fine silver (99.9% pure silver)
The most common silver stamp you will see on jewelry is 925, which indicates sterling silver.
Platinum Stamp Meanings
Platinum jewelry is also marked with purity stamps.
Common platinum stamps include:
PLAT
950
900
Platinum marked 950 contains approximately 95% pure platinum, which is the most common purity level used in jewelry.
Are Jewelry Stamps Always Accurate?
While stamps can provide useful clues about metal purity, they are not always reliable.
Some counterfeit jewelry includes fake stamps designed to make plated items appear genuine. Because of this, professional jewelers often verify metal purity using additional testing methods.
How to Verify Jewelry Purity
There are several reliable ways to confirm whether jewelry contains real precious metals.
Common testing methods include:
Magnet testing
Weight testing using precision scales
Acid testing using professional testing kits
Acid testing is one of the most reliable methods used by jewelers to confirm metal purity.
View professional testing kits here:
Jewelry Testing Kits for Gold, Silver & Platinum | Acid Test Kits | GTE – GOLD TESTING EQUIPMENT
Why Testing Tools Matter
Professional testing tools allow buyers and collectors to verify precious metals quickly and accurately.
These tools are commonly used by:
Pawn shops
Jewelry buyers
Coin dealers
Precious metal collectors
Gold refiners
Browse professional jewelry testing tools here:
Jewelry Testing Kits for Gold, Silver & Platinum | Acid Test Kits | GTE – GOLD TESTING EQUIPMENT
Final Thoughts
Jewelry stamps provide important clues about metal purity and can help identify whether an item contains gold, silver, or platinum.
However, stamps alone do not always guarantee authenticity. Using proper testing tools allows you to confirm metal purity and determine the true value of jewelry.