Gregori utilised a refined burin technique to create depth without relying on heavy cross-hatching. His work on Le Parche and The Sleep of Venus demonstrates a mastery of soft tonal transitions. He prioritised the structural integrity of the human form, as seen in Saint Sebastian Tied to a Tree. By focusing on the interplay of light and shadow, he gave his prints a sculptural quality. His version of the Stoning of S. Stephen shows how he managed complex group dynamics through precise line work.

Modern collectors value Gregori for his ability to bridge the gap between historical documentation and fine art. His prints, such as the Baccanale, offer a window into the aesthetic preferences of the Grand Ducal court in Tuscany. These works provide a sense of classical order that fits well in contemporary interiors. The monochrome palette of his engravings ensures they remain versatile pieces for home galleries.