carat weight
Gem mass unit
Carat weight measures the mass of gemstones, particularly diamonds.
One carat equals 200 milligrams.
Larger stones are rarer, so carat weight significantly affects value—though cut, clarity, and color matter too.
A two-carat diamond costs more than twice what a one-carat stone of equal quality costs.
Not to be confused with karat, which measures gold purity.
- gramMetric mass unit
- pointExact location or meaning
- pennyweightTwenty grains per troy ounce
- certificationAttestation of qualification
- scaleMeasure of relative size
jeweler's loupe · milligram · appraisal · melee · ounce · inclusions · grain · facet · stone · color grading · luster · rarity · precious · precious metal · gold · transparency · value · flawless
diamond grading criteria
carat weightcolor
Visual hue property
clarity · cut · color grade · brilliance · fire