Caratura

Caratura refers to the unit of mass used for gemstones and pearls. It is a non-metric unit equal to 200 milligrams, or one-fifth of a gram. The term originates from the Greek word "keration," which referred to the carob seed, a small, light seed that was historically used as a standard for weighing precious materials due to its consistent weight. Today, the carat is an internationally recognized standard, ensuring uniformity in the trade of precious stones.

When discussing diamonds, the carat weight is often associated with the stone's size. However, two diamonds of the same carat weight can appear to be different sizes due to variations in their cut and proportions. For instance, a diamond with a deep cut might appear smaller than a diamond with a shallower cut, even if they weigh the same. The carat is also divided into points, with one carat equal to 100 points. This allows for more precise descriptions of smaller gemstones. For example, a quarter-carat diamond would be referred to as 0.25 carats or 25 points. The concept of caratura is fundamental to gemology and the gemstone market, providing a standardized measure for value and trade.