How Diamond Size Works: Carat Weight vs. Visible Spread

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Carat weight measures a diamond's mass, not its face-up size. Two diamonds of equal carat weight can look very different depending on their cut proportions. A well-cut stone may appear larger than its weight suggests, while a poorly cut one can look smaller. Visible spread—how big the diamond looks when viewed from above—depends on the table percentage and depth. So a 1-carat diamond with a spreadier cut might visually match a heavier, deeper-cut stone.