Diamond Guide´╗┐´╗┐

Why are diamonds weighed in a carat?

The carat is the standard unit of weight for diamonds and other gemstones, it takes its name from the carob seed. Because these small seeds had a fairly uniform weight, early gem traders used them as counterweights in their balance scales. The modern metric carat, was adopted by the United States in 1913 and other countries soon after. Today, a carat weighs exactly the same in every corner of the world.

Diamond anatomy

When a diamond is cut particular attention is paid to the following, these names will help you understand the 4 C’s which are Cut, Clarity, Colour and Carat.

The four C’s


Just as a pound is divided into 100 pence, a carat is divided into 100 points. For example, a 50-point diamond weighs 0.50 carats. The table below show the size of a diamond that has an ideal cut, but two diamonds of equal weight can have very different values depending on the other factors of the Four C’s: clarity, colour and cut.


How a rough diamond is transformed into a beautiful gem by being cut with precise facets. The shape most frequently used is a round brilliant cut and this has 58 facets which are positioned on the stone to allow the optimal reflection of light, this is called the stones “fire” or “brilliance”.  When a diamond is well-cut, light enters through the table (top of the stone) and travels to the pavilion (side of the stone) where it reflects from one side to the other before reflecting back out of the diamond through the table and this light is the brilliance we mentioned, and it's fiery effect that makes diamonds so mesmerizing.
If the stone is cut too deep or shallow the following effects happen.

Diamond Cut


Diamonds are graded by colour using a letter scale D being top all the way down to Z. The less colour a diamond has higher up the scale it will appear, most diamonds have some colour within them which will not be visible to the untrained eye.
The colour we use in most of our jewellery at Feu Diamonds is near colourless G-J.


A diamonds clarity is determined by naturally occurring features because diamonds are formed deep within the earth, under extreme heat and pressure, they often contain unique birthmarks, either internal (inclusions) or external (blemishes). These inclusions or blemishes are not visible to the human eye but are what make each diamond unique.

Diamond Clarity Guide