A Diamond's Carat Weight

Size is the most obvious factor in determining the value of a diamond. Carat (ct.) is the unique weight scale that is used to measure diamonds and other gems. One carat is divided into 100 points so a diamond of 150 points weights 1.50 carats.

Learn about a diamond's Carat Weight here

Larger diamonds are rarer than smaller diamonds and price rise exponentially with carat weight. Diamonds have "special points" (or diamond points): .25 carats, .50 carats, .75 carats, 1.00 carats and so on. Every time that a diamond hits a "special point", the price goes up.

ADX Tip: Can you tell the difference? With "special points", take into consideration that a .95ct diamond should be 6.4mm whereas a 1.00 carat should be 6.5mm. Visually the difference is minor but in terms of cost, the difference can be dramatic.

It can sometimes be confusing when talking about diamond points because it may be mistaken for Facets or Cuts of a diamond, but it actually means the weight unit of a diamond.

Carat size usually ranges on an average millimeter size per weight. Be sure to know the average of your carat size before you make your purchase. A 1.00 carat diamond has an average size of 6.5mm. Diamonds of equal size can have unequal values. Depending on how the diamond is cut, a 1.10 carat diamond could look like a .80 carat diamond.

ADX Tip: There is a huge value difference between 1.00ctw and 1.00 carat. Carat Total Weight (ctw) is a term that represents the total weight of all diamonds (or other gemstones) in a piece of jewelry. If a piece of jewelry is 1.00 ctw, it is referring to the total weight of all of the diamonds in the piece combined. However, if a piece of jewelry is 1.00 carat, it means that the centre stone itself is 1.00 carat.

Size is the most obvious factor in determining the value of a diamond. Larger diamonds are much rarer than smaller diamonds. Prices rise exponentially with the carat weight. Diamonds have "special points:" .25ct, .50ct, .75ct, 1.00ct and so on. Every time a diamond hits a special point the price goes up.

With these special points, take into consideration that a .95ct diamond should be 6.4mm where as a 1.00ct should be 6.5mm. Can you tell the difference? Visually, the difference is minor; but in terms of cost, the difference can be dramatic.

As with all precious stones, the weight, and therefore the size of a diamond, is expressed in carats. One carat is divided into 100 points so that a diamond of 150 points weighs 1.5 carats.

Diamonds of equal size can have very unequal values. Depending on how the diamond is cut, a 1.10ct diamond could look like a .80ct. Carat size usually ranges on an average millimeter size per weight. Be sure to know the average of your carat size before you make your purchase. A 1.00ct diamond has an average millimeter size of 6.5.

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