Understanding the difference between "carat" and "karat" is crucial when buying jewelry, as these terms refer to very different things—gemstone weight versus gold purity.

Let’s break down each term so you can make confident, informed choices when shopping for fine jewelry.

Carat: Measuring Gemstone Weight

A "carat" is a unit of weight used for gemstones like diamonds, rubies, and sapphires.

One carat equals 200 milligrams (0.2 grams).

This measurement helps jewelers and customers compare the size and value of different stones.

For example, a 1-carat diamond weighs 200 milligrams, while a 0.5-carat diamond weighs 100 milligrams.

It’s important to note that carat refers to weight—not size. Two stones with the same carat weight can look different in size depending on their cut and shape.

If you're looking for something unique and colorful, check out our selection of gemstone engagement rings.

You might also want to explore gemstone rings as beautiful and meaningful gift options.

Curious where gemstones come from? Take a look at how gemstones and diamonds are formed to learn more about their natural origins.

Karat: Indicating Gold Purity

"Karat" refers to the purity of gold used in jewelry.

It’s measured in parts out of 24—so 24-karat (24K) gold is 100% pure.

Because pure gold is very soft, it's often mixed with other metals like copper or silver to improve durability. This is why you’ll frequently see 18K, 14K, or 10K gold in jewelry.

Higher karat gold has a richer color and higher gold content, but it’s also softer and more prone to scratches.

Lower karat gold is more durable, making it a better choice for everyday pieces.

To see how karat purity affects style and wear, browse our collection of diamond wedding rings.

Regional Spelling Differences

In American English, "carat" is used to measure gemstone weight, while "karat" refers specifically to gold purity.

This helps avoid confusion between the two terms—although they sound the same, they mean very different things in the jewelry world.

Key Differences at a Glance

  • Carat (ct): Measures the weight of gemstones. One carat equals 200 milligrams.
  • Karat (K or kt): Measures the purity of gold. 24K is pure gold; lower numbers indicate gold mixed with other metals.

Frequently Asked Questions

Can a diamond be measured in karats?

No, diamonds are measured in carats, which represent weight. Karat is used only for describing gold purity.

Is 24-karat gold the best for jewelry?

24K gold is the purest, but it's also soft and can scratch or bend easily. That’s why 18K or 14K gold is often preferred for durable, everyday jewelry.

How do I know the carat weight of a gemstone?

Gemstone carat weight is typically listed by the jeweler and may also appear in certification documents. Special scales are used to measure it precisely.

Are higher karats better than lower ones?

Not necessarily. Higher karat gold is purer but softer. Lower karat gold is more durable, which may be more practical depending on how often the piece is worn.

Trying to decide between gemstone types? Compare lab-grown diamonds and natural gemstones to choose what’s best for you.

If you're after something more distinctive, browse our range of non-traditional engagement rings for bold and creative styles.