What is diamond carat?

Carat is the standard unit of weight for a diamond.

  • One carat is the equivalent of 0.2 grams.
  • The greater the weight of the diamond, the greater the value.

Carat Weight

Carat is measured in cts or points.

One carat is divided in to 100 points, therefore 0.25cts is equivalent to 25 points.

Below is a chart to show the different carat weight sizes:

What do carat weights look like?

Below is the carat weight scale that provides the actual size of the diamond by carat:

'Magic Weights'

Carat weights known as 'magic weights' signify a price increase once reached.

These are:

  • 1/2ct
  • 3/4ct
  • 1ct
  • 1.5cts
  • 2cts

‘Under-sizes' are diamonds that weigh just below a magic weight. In choosing a diamond which is slightly 'under weight' it is often possible to save up to 30%: e.g. in choosing a diamond weight of 0.95cts, opposed to the magic weight of 1ct. As carat is a measure of weight and not strictly size, it is possible that the two stones can appear to be the same 'size' when seen in direct comparison, though one is shy of a magic weight.

How to choose a diamond

  • Define your budget and spend as much as you are comfortable with. We can provide you with assistance to help maximise your budget.
  • An important factor to find a successful engagement ring is the finger size; remember that slender fingers can make small diamonds look bigger.
  • Consider lifestyle, will the ring be worn and seen on a regular basis?
  • Think about what sort of setting will hold the diamond. Are you looking for something plain or something a little more extraordinary?
  • Find out what size diamond the recipient may be expecting.

Other diamond quality factors: