Jewelry IdentifierJewelry Hallmarks & Stamps
Found a tiny stamp on a ring, chain, or clasp? Every mark tells you the metal, its purity, and roughly what the piece is worth. Look up any jewelry stamp below, or scan it instantly with the free Hallmark Reader.
Gold purity marks
585Gold585 means 14-karat gold — 58.5% pure gold.750Gold750 means 18-karat gold — 75% pure gold.417Gold417 means 10-karat gold — 41.7% pure gold.375Gold375 means 9-karat gold — 37.5% pure gold.333Gold333 means 8-karat gold — 33.3% pure gold.916Gold916 means 22-karat gold — 91.6% pure gold.875Gold875 means 21-karat gold — 87.5% pure gold.990Gold990 means near-pure 24-karat gold — 99.0% pure gold.999Gold / Silver999 means 99.9% pure — 24K fine gold, or fine silver when on a silver piece.14KGold14K means 14-karat gold — 58.3% pure gold.10KGold10K means 10-karat gold — 41.7% pure gold.18KGold18K means 18-karat gold — 75% pure gold.22KGold22K means 22-karat gold — 91.6% pure gold.24KGold24K means pure gold — 99.9% gold with no alloy.9KGold9K means 9-karat gold — 37.5% pure gold.KPGoldKP means 'Karat Plumb' — the gold is a guaranteed full, exact karat.AU750GoldAU750 means 18-karat gold — 'AU' is the element symbol for gold.
Silver marks
800Silver800 means 80% pure silver — a European silver standard below sterling.835Silver835 means 83.5% pure silver — a mid-grade European silver standard.900Silver900 means 90% pure silver — often called 'coin silver'.958Silver958 means 95.8% pure silver — Britannia silver, purer than sterling.STERLINGSilver'Sterling' means 92.5% pure silver — the same as a 925 stamp.
Platinum marks
950Platinum950 means 95% pure platinum — the most common platinum standard.PT950PlatinumPT950 means 95% pure platinum — 'PT' is the element symbol for platinum.PT900PlatinumPT900 means 90% pure platinum.850 (Platinum)Platinum850 on platinum means 85% pure platinum.PLATPlatinumPLAT (or PLATINUM) means the piece is solid platinum.
Plated & filled marks
GPGold-platedGP means Gold Plated — a thin layer of gold over a base metal.GFGold-filledGF means Gold Filled — a thick bonded gold layer, far more than plating.GEGold-electroplatedGE (or GEP) means Gold Electroplated — a thin electroplated gold layer.HGEHeavy gold electroplateHGE means Heavy Gold Electroplate — a thicker electroplated gold coating.RGPRolled gold plateRGP means Rolled Gold Plate — a mechanically bonded thin gold layer.EPNSSilver-platedEPNS means Electro-Plated Nickel Silver — silver plating, no solid silver.1/20Gold-filled fraction1/20 means the piece is gold filled — 1/20 of its weight is the stated gold.VERMEILGold over sterling silverVermeil means thick gold plating over solid sterling silver.
Stone & simulant marks
How to read a jewelry stamp
Most jewelry carries a small quality stamp, usually on the inside of a ring band, the clasp of a chain, or the post of an earring. There are three broad things a stamp can tell you:
- A number like 585, 750, or 925 is the metal's fineness — parts of pure metal per 1,000. So 750 means 75% gold, and 925 means 92.5% silver.
- A karat mark like 14K or 18K is the American way of showing gold purity out of 24 parts. 14K and 585 mean the same thing.
- Letters like GP, GF, PLAT, or PT tell you the metal type — but watch out: GP and GF mean gold-plated or gold-filled base metal, not solid gold.
Want every stamp on one page? See the full jewelry stamps and markings chart. Looking for the most common silver mark? See our full guide to what 925 means on jewelry. And remember: a stamp is a claim, not proof. To confirm a piece is what its mark says, run it through the free Hallmark Reader and the Is It Real? tool, or get a free jewelry appraisal.