Turn a gold ring toward the light and check the inside of the band, and you may find a small stamp reading 585. If you are sorting inherited or thrifted pieces and wondering what does 585 mean on jewelry, the answer is straightforward and usually welcome: it is one of the standard marks for solid gold.
A 585 stamp means the piece is marked as 14 karat gold: 58.5 percent pure gold, with the remaining 41.5 percent made up of other metals such as copper, silver, and zinc for strength and color. It is a fineness mark, expressed in parts per thousand. It states the gold standard the maker is claiming, not the maker, the age, or the value.
That gap between claim and proof is the whole point of reading a metal stamp, so it is worth understanding where 585 sits in the wider system before you trust it.
Why is 14K gold marked 585?
Two systems describe the same thing. The karat system splits gold into 24 parts, so 14 karat means 14 parts gold out of 24. The millesimal system states purity in parts per thousand. Divide 14 by 24 and you get 0.5833, which rounds to 58.3 percent, and the mark is set at 585 to guarantee a minimum of 58.5 percent gold content. So 585 and 14K are two labels for the same alloy, and you will see either one depending on where and when the piece was made. European and many modern pieces favor the three-digit millesimal number; older American pieces more often use 14K.
Pure 24 karat gold is soft and scratches easily, so most jewelry is alloyed down. At 58.5 percent gold, 14 karat is a common balance of real gold content, durability, and color, which is why the 585 mark turns up so often.
The full gold fineness table
585 belongs to a family of standards. Here is how the common marks line up across both systems:
- 375 = 9K: 37.5 percent gold, a lower-karat standard common in British and other European jewelry.
- 417 = 10K: 41.7 percent gold, the traditional US standard for the lowest karat commonly sold as gold.
- 585 = 14K: 58.5 percent gold, the workhorse standard for durable everyday gold jewelry.
- 750 = 18K: 75 percent gold, richer color and higher intrinsic value, softer than 14K.
- 916 = 22K: 91.6 percent gold, deep yellow, soft, common in South Asian and Middle Eastern jewelry.
- 999 = 24K: essentially pure gold, very soft, more common in bullion than in worn pieces.
Under the FTC Jewelry Guides, a US seller should only describe or mark an item with a karat quality if the metal actually meets it, and in the United Kingdom, hallmarking gold at or above a weight threshold is a legal requirement carried out by an assay office. In both systems the number is a regulated claim about content, not a decoration. Silver uses the same millesimal system on a different scale, so if your piece reads 925 rather than a gold number, our guide to what does 925 mean on jewelry covers that mark.
Where does the 585 stamp sit?
Manufacturers strike fineness marks in conventional, low-wear spots. On a ring, look inside the shank. On a chain or bracelet, check the clasp or a small tag soldered beside it. On a pendant or brooch, look on the back or a lower edge, and on earrings, on the post or clip. You will often find a maker’s mark, initials or a logo, struck right next to the fineness number. Because the number can sit in tiny type, a loupe and good light help you read a stamp accurately before you decide to trust it.
Is a 585 stamp a guarantee?
No. A stamp is a claim, and claims can be false. Counterfeiters strike 585, 14K, and other marks into plated or filled base metal precisely because the number makes buyers stop checking. A few honest first checks help you tell a genuine 585 piece from a stamped pretender:
- Watch the wear points. Solid 14K gold is the same alloy all the way through, so it wears gold. If high spots, edges, or the inside of a band show a different color, silver, gray, or brassy base metal, the piece is plated or filled regardless of the stamp.
- Try a magnet. Gold is not magnetic. A piece that pulls strongly to a magnet contains a ferromagnetic base metal, though a non-magnetic result does not prove gold, since many base metals are also non-magnetic.
- Read the whole mark. “585” alone is a claim of solid gold. Watch for qualifiers nearby such as “GP” (gold plated), “GF” (gold filled), or “1/20 14K,” which describe a thin gold layer over base metal, not solid gold. Our guide to gold filled vs gold plated vs solid gold explains those distinctions and why they change value so sharply. One specific case worth knowing by name: gold plated over a sterling silver base is called vermeil, and it carries its own value logic, covered in what is gold vermeil.
- Weigh the price against reality. Solid gold has a real metal cost tied to weight. A “585” piece selling far below that floor is usually not solid gold.
For a fuller walkthrough of at-home checks, including acid testing and when to leave it to a professional, see how to tell if gold is real.
What 585 does and does not tell you about value
Even a genuine 585 mark answers only one question: the metal standard. It does not tell you who made the piece, how old it is, or what it is worth. Value splits into different numbers that are easy to confuse:
- Melt value is the raw metal worth: the weight of the piece times its gold fraction (58.5 percent for 585) times the current gold price, minus a refiner’s margin. It is the floor, and for small thin pieces it is modest.
- Resale value as finished jewelry can sit well above melt for pieces with a desirable maker, design, stones, or condition, or close to melt for plain worn items.
- Retail replacement value on an insurance appraisal is typically the highest number, reflecting what it would cost to buy new at retail, not what a buyer will pay you.
Confusing these is the most common way sellers feel shortchanged. Our guide to what your jewelry is worth lays out which number applies to your situation so you compare like with like.
The bottom line
585 means solid 14 karat gold, 58.5 percent pure, the same alloy as a 14K stamp in a different notation. It sits in a tidy fineness family (375, 585, 750, 916 for 9K, 14K, 18K, 22K), and it is a regulated claim rather than a certificate. Read it the way an appraiser does: confirm it against wear, a magnet, and the full text of the mark before you count on it.
If you want a quick first read on a stamped piece, scan it with GemPeek. The app looks at the type, visible marks, materials, and condition and returns a likely identification with an estimated value range. Treat that as an informed starting point and confirm with a professional appraiser or an acid or electronic test before you sell or insure anything where real money is involved.