A stone saw whose blade cuts by means of abrasive slurry or modern diamond segments rather than ordinary wood-saw teeth.
Sega da pietra is a stone saw. Le voci del marmo describes traditional long, thin metal blades—sometimes over three meters long—that cut most stone by means of abrasives rather than teeth. Historically, sand mixed with water was fed into the cut; modern forms may use industrial diamond segments with running water.
Etymology
Italian: sega, “saw,” + da pietra, “for stone.”
Sculptor Notes
A stone saw illustrates an important distinction: in hard stone the blade can function primarily as a carrier and guide for the abrasive rather than as a row of cutting teeth.
References
https://levocidelmarmo.sns.it/scheda_oggetti_relazione.php?denom=sega&id=10