Carat vs Karat: What’s the Real Difference in Jewellery Terms?

Understanding the difference between "carat" and "karat" is crucial when purchasing jewellery, as these terms refer to distinct aspects of gemstones and gold.

In short: Carat (ct) measures gemstone weight — 1 carat equals 0.2 grams. Karat (kt or K) measures gold purity — 24kt is pure gold, 18kt is 75% gold, 9kt is 37.5% gold. Two confusingly identical-sounding terms with completely different meanings: one weighs the stone, the other grades the metal.

Let’s look at their meanings to clarify any confusion.

Carat: Measuring Gemstone Weight

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

One carat equals 200 milligrams (0.2 grams).

This precise measurement allows jewellers and buyers to assess a gemstone's size.

For instance, 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 of the same carat weight might appear different in size depending on their cut and shape.

If you're considering a gemstone engagement ring, check out gemstone engagement rings for a variety of options.

You might also want to explore gemstone rings as meaningful gifts for special occasions.

To understand more about where these stones come from, learn how gemstones and diamonds are formed.