Comparison and Differences of 10K, 14K, 18K and 24K Gold

Comparison and differences between 10K, 14K, 18K and 24K gold

Gold has been used for centuries and has always held a deep significance. Gold purity is expressed in karats. Pure gold, or 24-karat gold, is 100% pure. 10K gold, on the other hand, is only 41.7% pure. 14K gold, which is the most popular type of gold for jewelry, is 58.3% pure. Each level of purity has its own unique advantages and disadvantages. For example, 24K gold is more valuable and better suited for investment than 14K gold. Conversely, 10K gold is less expensive but extremely durable and better suited for affordable jewelry such as earrings. 14K gold offers a blend of durability and affordability and accounts for approximately 90% of engagement and wedding rings sold.

This article will tell you everything you need to know about the different types of gold and what you should look for.

How is gold purity measured?

Gold purity is classified according to the karat scale. The karat scale measures the ratio of pure gold to other alloys in a piece of gold jewelry. The higher the amount of pure gold in a ring or other piece of gold jewelry, the higher the purity level.

What is the karat count of pure gold?

Pure gold is 24 karats, which means that 24 out of 24 parts of the metal are gold. Although these terms sound familiar, the karat scale (K) used to measure gold purity is different from the carat (c) unit of mass used to weigh diamonds.

Isn't all gold jewelry made using pure gold?

Contrary to popular belief, when you buy a gold engagement ring or another type of jewelry, the metal used for the piece is likely not 100% gold.

Pure gold, or 24K gold, is gold that has not been mixed with other metals. 24K gold is not used for jewelry for several reasons:

• First, it is extremely soft. Because pure gold is very soft, it bends and warps easily, making it a poor metal for jewelry that needs to maintain its shape. Pure gold also scratches easily, meaning that pure gold jewelry quickly becomes scuffed and unsightly.
• Second, it is very bright. The color of pure gold is much brighter and more orange than what most people associate with gold used in jewelry. This is why it is generally not an attractive metal for rings, watches, and other gold jewelry.
• Third, it is extremely expensive. Pure gold contains almost twice as much gold as 14K gold (the type of gold most commonly used for jewelry in the United States), which means that producing jewelry from this metal costs much more. On the other hand, it is the best type of gold for selling your gold for cash in the future.

For these reasons, it is very rare for 24K gold to be used in engagement rings and other types of wearable jewelry in the United States and other Western countries.

24K gold is instead popular in China and other Eastern markets, where it is used in traditional Chinese wedding jewelry such as bracelets, in gold bullion, and as a material for other collectibles.

Gold Karat Scale

The purity level of gold is classified according to the karat scale. Depending on the proportion of pure gold to other alloys, gold used in engagement rings and other jewelry is generally classified as 10K, 14K, 18K, 22K, and 24K.

Each type of gold has a different purity level. Pure gold, or 24K gold, is 100% pure. 10K gold, on the other hand, is only 41.7% pure. 14K gold, which is the most popular type of gold for jewelry, is 58.3% pure.

There is no "best" type of gold for every application. Instead, each level of purity has its own range of advantages and disadvantages. We present them below:

18K Gold: Advantages and Disadvantages

• Advantages: As pure as possible while remaining practical; looks great.
• Disadvantages: Expensive and easy to scratch.

18-karat gold is composed of 75% gold and 25% alloy. This type of gold is called 18 karat because 18 of the 24 parts that make up the gold are pure gold. 18-karat gold is generally the purest form of gold used for rings, watches, and other wearable jewelry.

18-karat gold has a rich, yellow appearance that makes it an attractive material for engagement rings and other jewelry. Because 18K gold is almost pure, there is very little risk that jewelry made from this material will cause skin irritation if you are allergic to nickel.

In short, 18-karat gold looks fantastic, with the classic yellow color that most people associate with gold jewelry.

However, 18K gold also has several disadvantages. First, because it is very pure, it is quite easy to scratch jewelry made of 18-karat gold. If you are active or work in an environment where your ring might bump into hard surfaces, 18-karat gold may not be the best choice.

18-karat gold is also much more expensive than other types of gold. Compared to a 14-karat gold ring (read our comparison between 14-karat and 18-karat gold), which has a similar appearance but is not as bright or saturated, you will generally have to pay up to twice as much for an 18-karat gold ring.

Overall, 18K gold is a good choice if you want gold jewelry that is as pure as possible while maintaining a degree of practicality. However, it is not the best option if you need a very durable ring or if your budget is limited.

14K Gold: Advantages and Disadvantages

• Advantages: An excellent blend of purity, durability, and value for money.
• Disadvantages: More expensive than 10K gold, but still quite affordable.

14-karat gold is composed of 58.3% gold and 41.7% alloy, or 14 parts gold out of 24. 14-karat gold is the most popular gold for rings and other wearable jewelry in the United States, the United Kingdom, and other Western countries.

Approximately 90% of engagement and wedding rings are made of 14K gold, making it a good choice if you are unsure which type of gold is best for your purchase.

14K gold has a rich color, with the classic gold look that most customers are looking for in rings and other jewelry. Its color is slightly less saturated and intense than that of 18-karat gold, making it an excellent choice if you want rich, attractive gold jewelry that isn't too yellow.

Compared to 18-karat gold, the main advantages of 14-karat gold are its durability and affordability. 14-karat gold rings and other jewelry are significantly more durable than those made of 18-karat gold, making this type of gold a good choice if you are concerned about scuffs and scratches.

14-karat gold is also more affordable than 18-karat gold, making it a good option if you are looking for a blend of quality, durability, and value for money.

10K Gold: Advantages and Disadvantages

• Advantages: Very affordable, more durable than other types of gold.
• Disadvantages: Pale yellow color, increased risk of metal allergies.

10-karat gold is composed of 41.7% gold and 58.3% alloy, or 10 parts gold out of 24. 10-karat gold is the least pure, least expensive, and most durable form of gold used in jewelry. It is also the most impure form of gold that can still legally be called gold in the United States and most other countries.

Although it is widely used for earrings and affordable jewelry, 10K gold is not a very popular metal for engagement rings and fine jewelry. Many high-end luxury jewelry retailers do not even offer 10K gold pieces because of its relatively low gold content.

Aesthetically, 10K gold has a pale appearance, with a yellow tone that is significantly less rich than 14K or 18K gold. Some appreciate it for its visual subtlety, while others prefer the richness of the gold tone found in 14K and 18K gold jewelry.

The main advantages of 10K gold are its cost and durability. 10K gold is the cheapest type of gold available in the United States, making it a good option if you are buying a ring or other piece of jewelry on a tight budget.

Because its gold content is the lowest of any gold type, 10K gold is also very durable. It is very difficult to scratch, scuff, or bend a 10K gold piece of jewelry, which is worth considering if you work in an environment with hard surfaces that could scratch or damage your jewelry.

Which gold is most suitable for custom jewelry and engagement rings?

Are you looking for an engagement ring? Choosing the perfect ring goes beyond just selecting the diamond and the setting. The type of gold used for an engagement ring can have a huge impact on its look, feel, and durability.

More importantly, making the right choice can help you get the most for your money. Take this ring from James Allen, for example. Depending on the metal chosen, the price difference is $200. This means you can get this diamond, or if you opt for the 14K version of this ring, you can get this diamond which is 40% larger, all while spending the same amount of money.

Contrary to popular belief, there is no single type of gold used for all gold jewelry. The gold used for rings, bracelets, watches, and other fine jewelry is rarely 100% pure gold.

The most common gold purity levels are 10K (karat), 14K, 18K, and 24K. Each gold purity level has its own range of advantages and disadvantages, from hardness and durability to the risk of skin irritation associated with certain gold purity levels.

Of the four most common gold purity levels, 10K is the most durable, although it also has the lowest gold content. 14K gold is slightly purer but also very durable, while 18K gold is the purest.

Which type of gold is best for you?

There is no "best" type of gold for everyone. When choosing gold for an engagement ring or other jewelry, it is important to keep in mind factors such as your or your partner's skin sensitivity, your career, your activity level, and your aesthetic tastes.

It is also important to consider your budget. While an 18-karat gold ring may look fantastic, it will almost always cost significantly more than a similar 14-karat or 10-karat gold ring.

Most of the time, 14-karat gold offers the best combination of rich colors, good durability, and a reasonable price. This type of gold is by far the most popular option for engagement rings and other fine jewelry, accounting for approximately 90% of gold jewelry sales in the United States.

If you prefer something more luxurious and don't mind trading some durability for a richer color, 18-karat gold can be a good choice. However, be aware that this type of gold is quite soft and can scratch easily when you or your partner are working or exercising.

Most of the time, 10-karat gold is not used for engagement rings. Since the price difference between 14-karat and 10-karat gold is negligible, the vast majority of reputable jewelers offer 14-karat gold as the most affordable option for engagement rings.

If you see a 10-karat gold engagement ring, it is often a good indicator that the diamond or other gemstone is likely not up to standard.

FAQs about gold types

Comparison of 10K, 14K, 18K and 24K gold: the reference table

Everything starts from a single idea: the karat expresses a proportion of fine gold out of 24. 24-karat gold is pure gold; 12-karat gold would contain exactly half fine gold.

The conversion is mechanical: karats ÷ 24 × 1000 = fineness in millesimal. It is this value in millesimal that is found engraved on European jewelry.

Why is gold alloyed?

Fine gold is one of the most ductile metals known. It can be stretched into extremely thin wires and hammered into nearly transparent sheets. These properties are wonderful for gilding, but catastrophic for a ring worn every day.

Metalworkers therefore add copper, silver, zinc, and sometimes palladium or nickel. These additions change three things at once: the hardness, the color, and the chemical reactivity of the surface.

This is why one cannot say that a fineness is "better" than another in absolute terms. One can only say it is better suited for a given use.

Color depends on the alloy, not the fineness

Yellow gold, rose gold, and white gold can all be 18 karats. They contain exactly the same amount of fine gold: 750 thousandths. What differs is the nature of the remaining 250 thousandths.

• Yellow gold: silver/copper balance.
• Rose gold: dominant copper, which pulls the hue toward red.
• White gold: white metals (palladium, nickel, silver), almost always finished with rhodium plating which provides the characteristic cool white.

24 karats: pure, but not for everything

At 999 thousandths, gold is at its maximum commercial purity. Its yellow hue is as saturated as it gets and it does not oxidize. But it is also the most mechanically fragile.

It is for this reason that 24 karat gold dominates investment and traditions where jewelry acts as a store of value, while daily-wear jewelry generally stops at 18 or 22 karats.

A word on 22 karats

916 thousandths is the great Indian and Middle Eastern standard. It offers almost the color of 24 karat gold with slightly better mechanical durability, which explains its popularity for traditional finery.

18 karats: the European jewelry standard

750 thousandths is the historical balance point of the French market. Enough fine gold for a full color and good chemical stability, enough alloy to hold a setting.

It is also the fineness of the eagle’s head hallmark, the most iconic of the French hallmarks for gold.

14 karats: the versatile American standard

585 thousandths is the default fineness for a large part of North American jewelry, and a perfectly legal fineness in France. It handles shocks better than 18 karat gold while maintaining a frankly golden hue.

For many pieces worn daily, it is the most rational compromise between brilliance and robustness.

10 karats: robust, but outside French finenesses

417 thousandths is less than half fine gold. The alloy becomes significantly harder, the hue pales, and the share of reactive metals increases.

An important point, too often overlooked: 417 thousandths is not among the legal French finenesses. The European counterpart to 10 karat gold is 9 karat gold at 375 thousandths.

Hallmarks: reading a French piece of jewelry in ten seconds

A gold work sold in France bears a fineness hallmark. The three most common for gold:

Next to it often appears the maker’s mark or responsibility mark, in the shape of a diamond, which identifies the manufacturer. On imported pieces, numerical markings (750, 585, 375) are encountered rather than symbols.

And on plated jewelry?

A gold-plated piece does not bear a solid gold fineness hallmark, since the mass of the jewelry is not gold. Instead, mentions such as "GP", "plated", or an indication of thickness in microns are found.

How to recognize, in practice, an announced fineness

1. Locate the engraving. Chain clasp, inside of a ring, back of a pendant, earring post.
2. Decode. Three digits = thousandths. A number followed by K = karats.
3. Cross-reference with color. A very pale yellow announced as 22 karats should make you question it.
4. Cross-reference with mass. Gold is a heavy metal. A large piece announced as solid gold and surprisingly light deserves verification.
5. In case of real doubt, only a laboratory test or a professional can decide. Home tests give clues, not proof.

Frequent errors in comparing gold

Translating "more karats" as "better quality"

Fineness measures composition, not manufacturing quality. A perfectly finished 14 karat piece is worth more than a sloppy 18 karat piece.

Comparing a solid and a plated piece on the same axis

These are two different categories. On a plated piece, the useful question concerns the thickness in microns and the quality of the underlayer, not the mass fineness.

Forgetting rhodium plating on white gold

The cool white of a white gold comes from a layer of rhodium on the surface. This layer wears out and is reapplied: this is normal maintenance, not a defect.

Believing a low fineness protects from everything

A harder alloy scratches less, but reacts more to sweat and cosmetics. You gain on one side, you lose on the other.

Relying solely on the announced weight

Weight without fineness says nothing about the amount of fine gold. 10 grams of 10 karat gold contain significantly less gold than 10 grams of 18 karat gold.

Glossary of fineness

• Karat (gold): proportion of fine gold out of 24.
• Thousandth: same proportion out of 1000.
• Fine gold: pure gold, without added metal.
• Alloy: metallic mixture intended to harden and color gold.
• Fineness hallmark: mark officially attesting the fineness.
• Maker's mark: diamond shape identifying the manufacturer.
• Rhodium plating: deposit of rhodium whitening the white gold.
• Micron: thousandth of a millimeter, unit of plating thickness.
• Ductility: ability of a metal to be stretched without breaking.

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FAQ: the questions we are asked most

What is the difference between 10k, 14k, 18k and 24k gold?

It is the proportion of fine gold in the alloy: 417 thousandths for 10K, 585 for 14K, 750 for 18K, and 999 for 24K. The rest is composed of other metals that harden and color the metal.

Which gold karat is the strongest?

The lowest. Since alloying metals are harder than fine gold, 10 karat resists scratching better than 18 karat, and 24 karat is the softest of all.

Why is 24 karat rare in daily-wear jewelry?

Because at 999 thousandths, gold is extremely malleable. It deforms and scratches very easily, which reserves it for ingots, investment coins, and certain jewelry traditions.

Which gold finenesses are legal in France?

The finenesses recognized for gold works are 999, 916, 750, 585, and 375 thousandths. 417 thousandths corresponding to the American 10 karat is not one of them.

Is gold karat and diamond karat the same thing?

No. Gold karat is a proportion out of 24. A stone's karat is a unit of mass. Two different magnitudes that bear the same name.

How to convert karats into thousandths?

Divide the number of karats by 24 and multiply by 1000. 18 ÷ 24 × 1000 = 750. The formula works for any fineness.

Read also on the Emir ICE blog

• 10K vs 14K gold: which is the best choice?
• 14K vs 18K gold: the daily duel
• White gold or silver: what to choose?
• Which metal to choose for custom jewelry
• Cleaning tarnished gold jewelry

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