Carat weight in Natural Emeralds
Most of the time when we indicate the size of an emerald we do it in carats. A carat is a unit of weight equivalent to 0.20 grams. In the jewelry trade we use this as “synonym” of size. Both are directly related and most of the time that we talk about size we talk about carat weight more than millimeters or inches.
For people that is not familiar with jewelry and precious gems the term carat can be confused with “karats”. These are two totally different things. The term karat is used as a measurement of gold purity (24 Kt gold, 18 Kt gold, 14Kt gold…) and it doesn’t have anything to do with a gem’s size and weight. In the same way when we talk about carats in emeralds or any other gems it won’t be related to its quality or purity.
As the carat weight increases so does the price of the gem and more importantly, the price per carat. This can be calculated by dividing stone price by its carat weight. Larger emeralds are rarer than smaller ones and very difficult to find in mines. On average, they have to remove 5 tons of dirt to find an emerald over 1 carat in gem quality. That is why a 3 carat emerald will cost more than three emeralds of 1 carat each of the same quality.


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