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Large gems are more rare than small ones, so they often cost much more per carat, even if they’re of equivalent quality.

 

A few gemological terms:

Per-carat price: The price of a gem divided by its carat weight.

Metric carat: The international unit of measurement for gem weight. One carat equals 0.20 gram.

Point: One one-hundredth of a carat (0.01 ct).

Unit price: The price per piece.

 

Photo: Michel Viard/AFP Courtesy: GIA.
Resource: Amanda. #eClarity