This is the weight of a diamond measured in carats. One carat is divided into 100 “points,” so that a diamond of 75 points weighs 0.75 carats. The carat-weight of a diamond is the easiest measurement to determine. There is 0.2 grams in 1 carat, which makes 1 gram 5 carats. The word “carat” comes from the seed of the carob tree pod which is found in tropical climates. These seeds were used until this century to weigh precious gems.

How Carat Weight Affects Value

Larger diamonds are more rare and in more demand than smaller diamonds of the same quality. A one carat diamond solitaire ring is nearly always more expensive than a diamond ring made up of multiple diamonds that are similar, but smaller, even though they total one carat or more.
Diamonds that weigh just under the next full carat are typically less expensive than diamonds passing the full-carat.
TIP: As the carat weight of a diamond increases so does its rarity and therefore its price. Most importantly, two diamonds can be of equal carat-weight, but their value can differ greatly due to their cut, colour, and clarity.

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