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. Avaialble in 3 size 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.