This is the final instalment of our series on the 4 Cs (Colour, Clarity, Cut, and Carat Weight) of diamonds. Part 1 covered colour, part 2 looked at clarity and part 3 discussed cut. Today we’ll conclude this series with some quick notes on carat weight.

The Basics

The standard unit for selling diamonds is by carat (or ‘ct’). Most people generally refer to a carat as a measurement of size, but it’s actually its weight! One carat is 0.2 grams.

Commonly you’ll hear about quarter-carat, half-carat, one carat, two carat diamonds – these are popular sizes. In between those, you get into carat weights with decimal places, like a .67ct stone. A ’10-point’ or ’10-pointer’ is a .10ct diamond, so weighing one tenth of a carat.

Carat Weight - The Bench Jewellery Co.

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Price per Carat

As we’ve detailed in our previous posts on the 4 C’s, what you decide you want for carat weight will have an impact on the other aspects of diamond quality – colour, cut and clarity. To get the diamond you want at the price you want, you can adjust any four of these factors up or down. However, the price of diamonds at larger carats start to increase quite drastically …

Say a 1 carat diamond costs $5000. A 2 carat diamond (at the same colour, cut and clarity) should cost $10,000 then – right? Regrettably, this is not the case.

Larger diamonds are very rare, so once you go past the 1.00 carat mark the price per carat starts to increase (physics 101: think acceleration vs. speed for a car). Instead, a 2 carat stone might be north of $20,000 and a 3 carat over $60,000.

How Do I Get The Best Value for a Diamond?

When it comes to carat weight, there are a few tips for those on the hunt for good value.

The most common diamond sizes you’ll hear or see will be “half carats”, “three-quarter carats”, “two carats” and so on. Nice, even numbers. By looking at diamonds at odd weights you can get better value. Opt for the 0.40 carat stone and you’ll barely notice the difference from a half carat.