Why are diamonds cut into facets?

Facets are the flat, precisely angled surfaces cut into a diamond to redirect light into visible brilliance and fire. Without them, a rough diamond, whether grown in a lab or pulled from the earth, is an opaque, unremarkable crystal. The technique that made modern faceting possible traces to 1456, when Lodewijk van Bercken in Bruges developed a polishing method using diamond dust, enabling cutters to work in layered tiers rather than simple flat planes. A standard round brilliant carries 57 or 58 facets, each positioned to reflect light internally before releasing it through the crown. IGI-certified lab-grown diamonds receive the same faceting standards applied to any fine stone, so cut grade on your certificate directly predicts how much light the diamond returns. When comparing stones, prioritize cut grade above color or clarity; a well-cut lab-grown diamond outperforms a poorly cut one at any price point.