2mm bicone crystals are small, faceted beads made of high-quality glass or leaded crystal, characterized by a double-cone shape that creates a dazzling sparkle and is ideal for intricate jewelry and craft projects. The "2mm" refers to the bead's approximate diameter, while the "bicone" refers to its symmetrical, pointed shape, and "crystal" denotes its material, offering enhanced brilliance and clarity compared to regular glass.