The rolling mill was invented in the late Middle Ages and replaced the classical hammering of gold into sheets. Because of the high malleability of precious metal extremely thin sheets or wire can be produced this way which can then function as the building blocks of a jewelry item. Sheet can be further worked by chasing, repoussé, striking and stamping or be decorated by soldering on filigree or granulation.
The Basic Principle of a Rolling Mill.
A Rolling Mill Featuring Combination Rolls to Make Gold Wire.