This measuring tool combines both functions of a ring mandrel and a ring size gauge. Dismantled, it works as a 30-piece set ring size gauge. When all 30 pieces are stacked up, it works as a ring mandrel with easy size readings engraved into the aluminium surface. Magnets hold the individual pieces together. The dark to light gradient from bottom up serves as an easy recognition when piecing the mandrel back together. The Jewellers’ Measuring Tool is highly functional, and yet presents itself as a centrepiece tool in a jewellery store.