It appears that your browser does not support JavaScript

How Is a Diamond Carat Measured?


Although the jewelry industry terms “carat” and “karat” are often confused, they refer to two distinct concepts. The former is a unit of mass that encompasses a number of different gemstones while the latter is a unit of proportion that applies strictly to the purity of gold.

The Metric Carat

Carats are a reflection of the international metric system and correspond to the specific weight of 200 milligrams, or one-fifth of a gram. Prior to July 1st, 1913, the unit of measurement used in the United States was actually 205.3 grams. And in 2002, the American Society for Testing and Materials (ASTM) decreed that gemstone metric measurements should be listed in milligrams rather than carats. Between 1909 and 1913, the notion of the metric carat was adopted at various different points by Belgium, Bulgaria, Denmark, France, Holland, Italy, Japan, Norway, Portugal, Romania, Spain, Sweden, Switzerland and the United Kingdom.

The Carat Measurement Yardstick

The carat measurement yardstick is one of several benchmarks used to price diamonds, along with a particular sample’s color, clarity and cut. In the summer of 2010, Calgary, Alberta based Kimberlight Brands launched a new record-breaking 111-face diamond cut created by Saskatchewan diamond cutter Mike Botha. under the brand name “Las Vegas cut.” Such a cut, because it can help bring out the full clarity of a stone, can be sometimes as important as the number of carats or milligrams.

Largest Diamond

The largest diamond ever excavated is the Cullinan Diamond, found on January 26, 1905 in a mine in South Africa. In its rough form it tipped the scales at an astonishing 3,106.75 carats, or 621.35 grams, before being cut down to three and eventually nine smaller stones that are presently a part of the British Crown Jewels.


Sizes of things and the units used to describe them

Vancouver Sun Latest Breaking News Business Sports Canada Daily News
Saskatchewan Man Designs One of the most Intricate Diamond Cuts in the World

Cullinan Star Cut Diamond
Eight Legendary Diamonds

Copyright 2009-2018

Sophisticated Media LLC

Terms of Service l Privacy Policy

Contact Us