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 …

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