Carat records weight. Cut determines how deliberately a diamond returns light—and therefore how alive it appears when worn.

Weight is not visual size

Two diamonds of equal carat can present differently from above. A stone may hide weight in excessive depth, while another uses balanced proportions to create a broader, brighter face-up appearance.

Measurements in millimetres help translate carat weight into the size the eye actually sees.

Light performance needs balance

Brightness, contrast and scintillation work together. A diamond that is bright everywhere can appear flat; controlled dark-and-light patterning gives facets definition as the wearer moves.

Cut grades are an important filter, but direct observation remains valuable because character exists within any grade range.

Choose for the setting

A bezel, halo or open prong setting changes perceived scale and the path of light. Judge the complete ring or jewel rather than buying a laboratory report in isolation.

Compare in honest light

View candidates away from intense showroom spotlights. Diffused daylight, ordinary indoor light and gentle movement reveal more about everyday performance.