Duckbill shears: special scissors with short blades and curved blunt tips used primarily for trimming the lips of vessels. Diamond shear: jaw-like scissors designed to cut hot glass or grip blowpipes, punties, or other hot objects.
Diamond shear: jaw-like scissors designed with two parts, one to cut hot glass and an other to grip blowpipes, punties, or other hot object.

3D Model - Straight shears
3D Model - Diamond shears