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DIAMOND CARAT WEIGHT

Carat Weight is perhaps the easiest of the 4Cs to understand when evaluating a diamond. Carat  is a measurement of the weight of a diamond. It tells you how big the diamond is. One carat is equal to 200 milligrams. The measure of carat is derived from the Carob plant (chocolate subsittute). The carob seeds are evidently very consistent in weight and they were used to measure the weight of diamonds.

 

Diamond Carat Weight

 

POINTS OF A CARAT

One carat is divided into 100 parts (just like the dollar); and each of these parts is called a "point."  Carat weight can be wrtten as a fraction or as a decimal. For example: .25ct is the same as 1/4ct. And you notice that "ct" is the abbreviation for Carat.

 

CARAT TOTAL WEIGHT

Sometimes you will see the abbreviation "ctw", which stands for Carat Total Weight - usually the weight of all the diamonds together in a ring or piece of jewelry.

 

SIZE AND PRICE OF A DIAMOND

It is easy enough to understand that generally the larger the diamond, the more expensive it will be. (We always say "generally" because the 4Cs together detemine the value of a diamond. A smaller diamond could be more valuable if it is more colorless for example.) However the price of diamond does not go up in the same proportion as the weight.  A 1 Carat diamond can be 3 times the cost of the same quaity 1/2 Carat diamond, even though the size is doubled.  This is because the larger the diamond, the rarer it is. 

 

There are many ways to obtain the "look" of a larger diamond and still stay within your budget.  Read more>>

 

Quick Note: Carat is the measure of a diamond's weight, but Karat is the measure of gold weight.