Diamond cuts—the shape, proportions, and arrangement of facets in a diamond—are often judged by their relation to light. Brilliance, fire, scintillation, and overall appearance play into a diamond’s assigned value. Before the advent of electricity, the best way to ascertain a diamond’s brightness was to hold it up to candlelight. The ideal cut for such subtle lighting was the rose cut, as captured candlelight shone right through it.