The Lucky Store DiamondMate Professional Diamond Size Gauge Tool is an essential reference instrument for jewellers, gemologists, diamond traders, and jewellery manufacturers. Designed with 9 precision-sized simulated stones ranging from 0.10 to 1.00 carat, it enables quick and reliable visual comparison to estimate the size and approximate carat weight of round diamonds. Its compact and lightweight design makes it easy to carry in a pocket or jewellery toolkit, making it ideal for jewellery stores, workshops, exhibitions, gemstone laboratories, and trade shows. Whether evaluating loose or mounted stones, the DiamondMate provides a convenient reference for fast and consistent diamond size estimation.