Diamond Pricing and the Four C’s – Part 4 (Carats)

This is part four (of four) of our Diamond Pricing and the Four C’s article. Read Part three here (Cut).


This is the term that most people are familiar with. The first question that is asked by many buyers, or friends and family that see a new diamond ring is usually, “Oh, how beautiful! How many carats is it?”

Technically speaking, the number of carats a diamond has is a reflection only of how much the diamond weighs, and not necessarily how big it is. One diamond can weigh more than another next to it, but depending on the diamond’s shape and cut may appear to be smaller. However, in general, the more carats a diamond has, the bigger it is.

Below is a comparison chart of carat weights vs diameters for an Excellent Cut Round shaped diamond…

diamond carats

A carat is 1/5 of a gram. Carats are also divided into smaller units called “points”. There are 100 points to a carat. Example: A diamond that is 50 points is half of a carat in weight.


Due to the scarcity of larger diamonds, the price of a diamond goes up dramatically as its carat size increases, as can be seen in the Diamond Price vs Carats chart.

For example, a 2 carat diamond is almost four times as expensive as 4 half carat diamonds.

Which is why rings with many smaller diamonds rather than one large rock are so popular with engagement ring shoppers on a budget. You can get a lot more “bling” for the buck!

Diamond Carat Buying Tips

Due to the popularity of the one carat diamond there is often a price jump as you approach 1 carat (See the Diamond Price vs Carats chart). You can save some money by selecting a diamond just below 1 ct, like 0.9ct. It will look virtually the same size, yet be quite a bit less expensive.

In addition to the four C’s, the quality of a diamond’s Polish, Symmetry and Fluorescence will also have an impact on the final price. Lastly there is the “Fifth C”, which is the diamond’s certificate.

Read Part one of Diamond Pricing and the Four C’s (Color) here.

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