Metals
Gold Karat Explained
Karat is a fraction out of twenty-four. Everything else about gold - color, hardness, price, skin reaction - follows from that one number and what fills the rest.
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The short answer
Karat is gold content out of 24 parts. 24K is 99.9% pure, 18K is 75%, 14K is 58.3% and 10K is 41.7% - the US legal minimum for calling something gold. The rest is alloy that sets hardness and color.
What to buy
| # | Pick | Material | Score | Price |
|---|---|---|---|---|
| 1 |  Belacqua 1/2 Carat Lab-Grown Diamond Stud Earrings, 14K Yellow Gold Solid 14K gold - the karat that best suits pieces worn every day Top pick | Lab-grown diamonds set in solid 14K yellow gold. Lab-grown diamonds are real diamonds - same carbon, same crystal structure, same Mohs 10 hardness. The gold is solid, not plated or filled.Best 14K piece | 9.2/10 | |
| 2 |  Carbon Atelier 1 Carat Lab-Grown Diamond Pendant, 14K Gold Solid 14K with a substantial stone, where setting strength matters | One carat lab-grown diamond in solid 14K gold. Real diamond, solid gold, no coatings anywhere.Best solid-gold pendant | 9.0/10 | |
| 3 |  Kooljewelry 14k Gold Filled Cable Chain Necklace 14K gold-filled - the same karat alloy on the surface, at a fraction of the price | 14K gold-filled (1.5mm cable, 18in). Gold-filled means a bonded gold layer that is at least 5% of the item's total weight - a legal definition under the FTC jewelry guides, not a marketing phrase.Best value in 14K color | 8.8/10 |
The conversion table
Karat marks are a fraction out of 24, so converting is arithmetic rather than convention. A stamp reading 585 and one reading 14K say exactly the same thing: the European system states parts per thousand, the US system states parts out of twenty-four.
| Karat mark | Millesimal mark | Gold content | Common use |
|---|---|---|---|
| 24K | 999 | 99.9% | Bullion, some traditional jewelry |
| 22K | 916 | 91.7% | Traditional South Asian and Middle Eastern jewelry |
| 18K | 750 | 75% | Fine jewelry, European standard |
| 14K | 585 | 58.3% | The US everyday standard |
| 10K | 417 | 41.7% | Budget fine jewelry; US legal minimum |
| 9K | 375 | 37.5% | Legal in the UK, not sellable as gold in the US |
What the other percentage does
The non-gold portion is not filler - it is what makes gold wearable. Pure gold is soft enough to deform with ordinary handling, so alloying is not a cost-cutting measure but a functional necessity for anything with prongs, links or a clasp.
The alloy also determines color. Yellow gold uses copper and silver in balance. Rose gold pushes the copper up. White gold uses white metals - historically nickel, now often palladium - and is almost always rhodium-plated to get the bright white finish people expect, which is why white gold rings need re-plating every few years while yellow gold ones do not.
Reading a hallmark
On a real piece you will find one of a few marks: a karat number followed by K or KT (14K, 18KT), a millesimal number (585, 750), or a qualifier. The qualifiers are the ones that matter, because they change the meaning entirely:
- GF or 1/20 14K GF - gold-filled. The gold is a bonded layer at 1/20 of total weight.
- GP, GEP, HGE - gold plated, gold electroplated, heavy gold electroplate. A coating.
- RGP - rolled gold plate. Bonded like gold-filled but at 1/40 of total weight, so half the gold.
- Vermeil - gold over sterling silver at a minimum of 2.5 microns.
A karat number with any of these letters after it describes the surface, not the piece. That single reading habit resolves most jewelry confusion.
What each karat costs you and gives you
Price scales roughly with gold content, so 18K costs about 29% more gold than 14K for the same weight. What you get for that is color depth and lower reactivity. What you give up is hardness.
The practical guidance: 14K for rings and chains worn daily, 18K for earrings, pendants and anyone with reactive skin, 10K only when budget is the binding constraint and you know you are not nickel-sensitive.
Every pick in detail
What each one is actually made of, how long it realistically lasts in that material, who it is for and who should skip it.
1 · Best 14K piece
Belacqua 1/2 Carat Lab-Grown Diamond Stud Earrings, 14K Yellow Gold
The first item here where nothing is a coating and nothing clouds. That is what the price is buying.
- What it is
- Lab-grown diamonds set in solid 14K yellow gold. Lab-grown diamonds are real diamonds - same carbon, same crystal structure, same Mohs 10 hardness. The gold is solid, not plated or filled.
- Realistic lifespan
- Effectively permanent. Mohs 10 stones in solid 14K gold is the only combination on this site with no wear-limited component at all.
- 0.5ct total
- Mohs 10
- solid 14K gold
What works
- Solid gold settings - no plating to wear off, ever
- Real diamonds at a fraction of mined-diamond pricing
- Nothing on this product has a countdown attached to it
What does not
- Lab-grown diamond resale is thin and prices have fallen steadily
- The most expensive earrings on the site by a wide margin
Skip it if: you are buying for resale or as a store of value. Lab-grown prices have been falling; buy these to wear for thirty years, which they will.
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Best for buying earrings once. Score 9.2/10 from published specifications.
2 · Best solid-gold pendant
Carbon Atelier 1 Carat Lab-Grown Diamond Pendant, 14K Gold
A full carat of real diamond in solid gold. It is the most expensive thing we link to and the only one with genuinely nothing to replace.
- What it is
- One carat lab-grown diamond in solid 14K gold. Real diamond, solid gold, no coatings anywhere.
- Realistic lifespan
- Effectively permanent for both the stone and the setting.
- 1.0ct
- Mohs 10
- solid 14K gold
What works
- Solid gold chain and setting - nothing to plate, nothing to wear
- A carat of real diamond at a price mined stones cannot approach
What does not
- Lab-grown resale value is weak and has been declining
- A single large stone concentrates all the value in one prong-held place
Skip it if: you are buying an asset. If the money is meant to hold value, this is not the instrument - buy it because you want to wear a carat of diamond.
#ad how we make money · price as of September 7, 2026
Best for a milestone piece bought once. Score 9.0/10 from published specifications.
3 · Best value in 14K color
Kooljewelry 14k Gold Filled Cable Chain Necklace
The clearest gold-filled starter chain in the set - the listing says gold-filled in those words, which is most of what you are paying for.
- What it is
- 14K gold-filled (1.5mm cable, 18in). Gold-filled means a bonded gold layer that is at least 5% of the item's total weight - a legal definition under the FTC jewelry guides, not a marketing phrase.
- Realistic lifespan
- Gold-filled worn daily typically holds its color 10-30 years. Assumes daily wear, removal for swimming, and no repeated chemical contact.
- 1.5mm cable
- 14K gold-filled
- 18in
What works
- Unambiguous gold-filled labeling - the material claim is checkable
- Cable link is the most repairable chain style if a link ever opens
- Gold-filled tolerates sweat and daily wear in a way plating does not
What does not
- Costs roughly twice a plated chain of the same look
- 1.5mm is dainty; it will not read as a statement chain
Skip it if: you change chains with the season. For a one-season trend piece a $12 plated chain is the rational purchase and we would not talk you out of it.
#ad how we make money · price as of September 7, 2026
Best for a first chain you want to still own in ten years. Score 8.8/10 from published specifications.
Common questions
What does 585 mean on gold?
585 parts per thousand gold, which is 58.5% - the millesimal way of writing 14K. The two marks mean the same thing; European makers tend to use the number, US makers the karat.
Is higher karat gold always better?
No. Higher karat means richer color and less alloy to react to, but also a softer metal that scratches and bends more easily. For a ring worn every day, 14K usually outperforms 18K in practice.
What is the lowest karat that can be called gold in the US?
10K. Below that it may not be described as gold under the FTC guides, which is why UK 9K pieces cannot be sold as gold in the US even though they are legal there.
Does the karat affect tarnishing?
Indirectly. Gold does not tarnish, but the alloy metals can, so lower karats show surface discoloration more readily. It cleans off and does not damage the piece.
Sources
Every specification and figure on this page traces to one of these. Where a source does not publish a number, the page says so rather than estimating one.
- 16 CFR 23.3 - Misrepresentation as to gold content (FTC Jewelry Guides) — Defines the gold-plate minimum (0.175 microns), heavy gold electroplate (2.5 microns) and the gold-filled 1/20th-by-weight threshold.
- 16 CFR 23.4 - Misuse of the word 'vermeil' — Vermeil requires a sterling silver base, gold of at least 10 karat fineness, and a minimum 2.5 microns throughout.
- 16 CFR Part 23 - Guides for the Jewelry, Precious Metals, and Pewter Industries — The full FTC Jewelry Guides, which govern every material claim quoted on this site.
Read next
- 14K vs 18K gold
The hardness trade in detail.
- How to tell if gold is real
Reading a hallmark, and the home tests that actually work.
- Gold filled vs vermeil vs plated
When the karat number is describing a coating.
- Jewelry glossary
Every mark and term on this site, defined.