Petrified Wood Agate Round 8mm Given the unique nature of cut gemstones, and the variety of manufacturers around the world that produce them, slight size variations may be noted. These slight variations may also impact the number of beads per strand. Bead sizes and counts are approximations, based on expected quantities and actual counts on samples selected at random from inventory to verify bead sizes and quantities. The number of beads you receive may vary from the approximate quantity indicated, but it should be within range.