What Does 585 Mean on Gold — and What Is It Worth?

585 stamped inside a ring or on a clasp means the metal is 58.5% pure gold — parts per thousand, the marking system most of the world uses instead of karats. It is the same alloy an American jeweler stamps 14K. Nothing exotic, nothing suspicious: if your “mystery European ring” says 585, you own a 14K ring, currently carrying about $81 of gold per gram at the $4,300-area spot level of early September 2026.

Why 585 and not 583?

Fourteen twenty-fourths is actually 58.33% — so the mathematically honest stamp would be 583, and for much of the twentieth century that is exactly what Soviet and some European mints used. The 585 convention won out for a quietly commercial reason: alloying a half-point above the 14K line guarantees the piece never assays under its stamp, in an era when under-karating lawsuits and reputational damage were live risks. A 583 piece from an old Russian estate is not inferior; it is the same alloy wearing the earlier, stricter arithmetic.

The two scales, one table

Fineness and karat convert directly — karat divided by 24, times a thousand. This is the whole map:

Neighbors on the table have their own stories — 417 is the American floor, and 750 is the luxury tier — but 585 is the one you will meet most often, because 14K is the workhorse purity of the entire US jewelry trade.

What a 585 piece is worth

Weight times 58.5% times the per-gram gold price. The 14K calculator does it live against the current spot price; as a September 2026 anchor, a 10-gram 585 bracelet holds roughly $810 of gold, and a buyer inside the normal payout band will offer somewhere between two-thirds and four-fifths of that. The stamp only tells you purity — the other half of the price is the per-gram rate on the day you sell.

Where you will meet 585, and one caution

Imported chains and findings, German and Scandinavian estate pieces, Eastern European wedding bands, and increasingly regular US mall inventory made overseas — 585 is everywhere once you start turning pieces over. The caution is the same one that applies to every mark: a stamp is a claim. Counterfeit 585 stamps on plated brass exist, which is why any buyer worth selling to verifies with a test rather than a loupe alone, and why a hallmark plus a magnet plus a test beats any one of the three. When it is time to act on the number, the selling guide takes over from here.

Reading the variants

The mark rarely travels alone, and its companions carry information. “585” beside a maker’s symbol and an assay mark suggests a European workshop piece; “14K 585” doubled up is common on goods made for export to both markets; “14KT ITALY” on a chain is the American karat idiom with an origin claim attached. Russian and former-Soviet pieces stamped 583 often lean rose — the era’s alloy recipes ran copper-heavy — so a pinkish 583 band is consistent with its paperwork, not evidence of tampering. What should raise an eyebrow is mismatch: a crisp modern 585 on a piece whose wear, solder seams, and style say something older, or a stamp that sits shallow on a surface where every other detail sits deep.

Questions people ask

Is 585 gold the same as 14K gold?

Yes — two labels for one alloy. 585 states parts-per-thousand fineness; 14K states parts-per-24. A piece may carry either mark or both, and neither is worth more than the other.

My piece is stamped 583. Is that worse?

Practically identical — the older Soviet-era rounding of the same 14-karat alloy. Buyers price 583 and 585 the same way; a refiner’s assay will read the actual metal anyway.

Is 585 gold magnetic?

No — gold, copper, silver, and zinc are all non-magnetic, so a genuine 585 piece ignores a magnet. A strong pull means a steel core or clasp spring; a faint response can come from nickel in white-gold mixes. The magnet is a useful liar detector but a poor truth detector: passing it proves little, failing it proves a lot.

Does a 585 stamp guarantee the piece is real?

No stamp guarantees anything; stamps are applied by whoever made the piece, honest or not. Weight, magnet response, and a proper test in front of you settle it. Treat the stamp as the hypothesis, the test as the verdict.