Letter markings on gold jewelry and how they affect value

The letter markings on gold jewelry can tell you a lot about a piece before you sell it. You might learn how pure the metal is, whether the piece is solid gold or gold-coated, where it was made, or who designed the jewelry. Knowing how to read these markings gives you a solid starting point for understanding what you own and what it’s worth.

Here's how to find the important marks, then understand what they can (and can't) tell you about the value of your gold.

What are gold jewelry letter markings?

Gold jewelry letter markings are small stamps, engravings, numbers, or symbols that tell you something about a piece, such as its purity or origin. Also called gold hallmarks, these markings are usually tucked somewhere discreet, like inside a gold ring’s band or near the clasp of a necklace.

Some gold marking symbols indicate how much pure gold the piece contains, while others identify who made or tested the piece or where it was hallmarked. Here are some common letter markings to look for on your gold jewelry:

• Purity and fineness marks: A purity mark tells you how much pure gold a piece contains. You may see a karat mark (like 14K or 18K) or a three-digit fineness mark (such as 585 or 750). The higher the number or karat is, the greater the proportion of gold the jewelry has.
• Maker’s marks: This mark, often initials or a logo, identifies the jeweler or manufacturer associated with a piece.
• Assay office marks: Assay office marks show where jewelry was officially tested and hallmarked. They’re especially common on jewelry from countries with formal hallmarking systems, where an assay office independently verifies the metal’s stated purity.
• Date letters: Some hallmarking systems use a letter to indicate when a piece was tested. Because the letter assigned to a particular year can vary by hallmarking system, you’ll need to consider it alongside other marks instead of interpreting the letter on its own.
• Country or import marks: These marks can indicate where jewelry was made, tested, or brought into a market. The exact symbols depend on the relevant country and period, so identifying the origin of a piece may require looking at several marks together.

Common gold purity markings and what they mean

Gold purity markings can be very important when valuing a piece, since they tell you how much of the jewelry is pure gold versus other metals. The gold karat scale measures purity out of 24 parts, while three-digit fineness marks express the proportions as parts per thousand.

If you’re trying to decode the numbers on gold jewelry, this table gives you the equivalent karat and purity. A 417 stamp on gold corresponds to 10K, for example, while 585 is the same as a 14K gold stamp.

Letters can add more context to a purity mark. “K” and “KT” mean karat, while “KP” stands for karat plumb (meaning the piece meets at least the stated karat purity). “Au” is the chemical symbol for gold, although sometimes “G” is used instead. 

Solid vs. non-solid gold markings

Certain letter markings indicate that gold has been applied over another metal, instead of used throughout the piece. If you see one of these abbreviations, here’s what it generally means:

• GP: Gold plated; a thin layer of gold has been applied over a base metal.
• HGP: Heavy gold plate; the piece has a heavier layer of gold plating over another metal.
• GF: Gold filled; a layer of gold (generally thicker than a standard gold plating) is mechanically bonded to a base metal.
• GE or GEP: Gold electroplate or gold electroplated; a thin layer of gold has been applied to the surface of another metal through this particular method.
• HGE: Heavy gold electroplate; the piece has a larger electroplated gold layer over another metal.

If a karat appears alongside one of these letter markings, that karat may describe the composition of the gold layer instead of the entire piece. That distinction can make a big difference when you’re trying to understand what your jewelry might be worth.

How gold markings can affect resale value

Markings can tell you about a piece’s metal content, which is one factor in how jewelry is valued. If two solid gold pieces have the same weight, but one is marked 18K and the other is marked 14K, the 18K piece contains a higher proportion of pure gold and will usually have a bigger melt value.

But a stamp alone can’t tell you what someone will pay for your jewelry, especially if a buyer plans to resell the piece instead of melting it down for gold. The jewelry's purity needs to be verified, and its value can also depend on its weight, its construction, the current gold price, and whether the design or gemstones add value beyond the gold.

Get a free valuation for your gold jewelry with Unvault

Gold markings can help you understand what you may have, but they can’t offer you a definitive selling price. A professional appraisal gives you a firmer basis for deciding what to do with your jewelry.

Unvault professionally evaluates your jewelry, so you know what you actually have and what it’s likely worth before deciding whether to sell. If you know a piece’s karat and weight, you can try Unvault’s Gold Calculator for a general estimate. Or you can request a free valuation to get more details and a potential no-obligation offer.

Get a free jewelry appraisal today with Unvault.