The guilloche dial engraving technique has been found in fine jewelry and on Faberge eggs since the 17th century. It has been utilized here in the Scallop by Projects Watches to express the full vision and richness of this quality-made timepiece. With its symmetrical rigor and shell-like geometry, the Scallop Watch is a highly sought after design icon.

Guilloche is the pattern of curved symmetrical lines on the dial (face) of the watch. The guilloche effect on the dial is created by first laying a fine film of the guilloche pattern over the dial of the watch. An acid wash is then painted over the voided areas without the guilloche pattern. These areas treated by the wash are etched away into a 0.1mm deep pattern. After this etching treatment the dial has a raised "guilloche pattern" with plain recessed areas below it. The Scallop dial is then colored utilizing an ionic electro-plating process.