Carats And Gemstone Grading


Step 4: Gem Grading

Lesson 2

Carats are units of measurement for gemstone weight. The term “carat” may have originated with the ancient practice of using carob seeds as a unit of measure in the Mediterranean and Middle East regions. The seeds were presumed to have a uniform size and mass. Today, the carat weight unit is standardized as 200 mg. “Carob (ceratonia siliqua) seeds” by Mihailo Grbic is licensed under CC By-SA 3.0 RS.
Carats are units of measurement for gemstone weight. The term “carat” may have originated with the ancient practice of using carob seeds as a unit of measure in the Mediterranean and Middle East regions. The seeds were presumed to have a uniform size and mass. Today, the carat weight unit is standardized as 200 mg. “Carob (ceratonia siliqua) seeds” by Mihailo Grbic is licensed under CC By-SA 3.0 RS.

What are Carats?

Carat is one of the four Cs of gemstone grading. In English, that sounds the same as carrot, but we aren’t discussing vegetables. Carat also sounds the same as karat, but that is a measure of the fineness of gold or the ratio of pure gold to alloy metals in a mixture. Karat is abbreviated as “K.”

A carat (abbreviated as “ct”) …

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