Moissanite is often sold using diamond-equivalent carat language, but millimeter dimensions provide a clearer description of visible size.

Why carat can confuse

Carat is a unit of weight. Moissanite and diamond have different densities, so stones with the same dimensions do not weigh the same.

Why dimensions matter

Length, width, and depth show the stone’s physical measurements. Face-up appearance depends primarily on length, width, shape, ratio, and setting.

Two stones can share an equivalent size but look different

A shallow stone may face up larger, while a deeper stone may carry more material below the girdle. Elongated shapes also distribute area differently than round stones.

When comparing moissanite, use exact millimeter dimensions and length-to-width ratio alongside any carat-equivalent description.