Abacus, from the Greek abax, the counting board. For five thousand years trade, debt and harvest were counted on its beads, from the Roman hand abacus to the Japanese soroban board with its sharp-edged double cones. Our Abacus Necklace draws the soroban bead into sterling silver, a chain strung like a count left open, closed by a bayonet clasp at the front. Available in 2 sizes - 50cm or 60cm Sterling silver 9.25 hallmark ensuring origin and material Comes in a jewelry pouch and gift box