Briolette beads are faceted, teardrop or pear-shaped beads, often without a girdle, that are drilled to hang as jewelry, creating a sparkly, shimmering effect due to their numerous triangular or rectangular facets. They come in many gemstone types like amethyst and quartz, as well as crystal glass, and are used in jewelry designs such as necklaces and earrings to add a unique, lustrous finish.