A simple yet very powerful tool for all diamond and gemstone merchants. Very easily sieve your round calibrated stones to perfect sizes using these Sieves. Available in 3 diameters 80mm, 66mm, and 47mm. They come with 42 plates and sizes ranging from 0.5mm to 4.5mm. Made from high-grade Stainless Steel and carefully cut from laser machines for precision holes. A must for every diamond trader. Also available is a special size 80mm with 75 plates for more intermediate sizes.