It is also irregular in shape and not as “pretty”.Īll gems listed here are round faceted and have the same depth as their diameter making them roughly spherical (think 20 sided dice). To make it easy, figure a rough gem is the same value as shown below but it is at least 4 times as heavy and its size is at least 1.25 larger than indicated. The yield from even well-shaped rough material is typically only about 25%. In order to overcome the weight loss in addition to the cost of cutting, a cut gemstone is more valuable than rough. The process of cutting and polishing it results in size and weight loss. When a piece is uncut it is called “rough”. I justify this by saying that larger stones are not as rare in my world. (One 4 carat gem is more valuable than four 1 carat gems.) To allow for larger stones in my game they don’t increase quite as fast as they do in the real world. The price per carat does not increase smoothly with increasing size. To keep it simple for D&D I am keeping the weight of all gems the same and only vary the value depending on gemstone type and size. The density of gems varies from very light stones like opal to especially heavy stones like sphalerite or zircon. In the real world, gem sizes do not determine weight. The information listed here is provided for those rare occasions when your character may need to carry an exceptionally large gem or a very large number of gems. Unless your character is carrying an extremely large number of gems, their weight is insignificant and you do not have to keep track of it. They are carried in small leather or cloth bags tied securely with a string or leather strap.
Standard gems carried by adventurers are 1/4″ in diameter. I started with the official D&D information and expanded on it. Here is some information regarding D&D gems.
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