Carat Diamonds

A carat is a unit of measurement used to weigh diamonds.

One carat equal to 0.2 grams, and is divided into 100 points; therefore making a 25 point diamond equal to ¼ or 0.25 carat.

The word carat comes from the Greek phrase “kerátion”, meaning “carob seed”; stemming from the assumption that the seeds, from the Ceratona Siliquia tree, had an unusually uniform weight of 0.2 grams. Carob seeds were used to measure the weight of diamonds until the system was standardised at the start of the 20th century, and the phrase “carat” became a unit of measurement synonymous with diamond quality.

Larger, higher-carat diamonds are much rarer than smaller stones, and therefore larger gems are more expensive. For example, a 1-carat stone would be worth more than twice as much as a ½-carat stone, even if it had a similar colour, clarity and cut. When purchasing diamonds, equal consideration should be given to colour, clarity and cut, so that the carat weight alone does not define the value of your diamond. These other factors also heavily influence the overall quality and worth of any diamond.

As the largest stockist of GIA and IGI certified diamonds in the UK, Marlows' expert team is on-hand to offer more detailed advice and information regarding the carat system.

Please don't hesitate to call our team today with any queries you may have.

Carat


Large diamonds are much rarer than smaller stones, and therefore larger gems are extremely expensive. For example, a 1-carat stone would be worth more than twice as much as a ½-carat stone of similar colour, clarity and cut.

When purchasing diamonds, equal consideration should be given to colour, clarity and cut, so that it is not the carat weight alone that defines the value of your diamond.

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