A marquetry-maker works with many different wood species in a range of colours. Veneers are cut into shapes then assembled into a design which can be the product of the marquetry-maker's imagination, inspired by an existing design or requested by the client. Marquetry-makers can choose among some 150 species of wood, for example amaranth, tulipwood, walnut and sycamore, offering some 60 to 70 natural shades, in addition to the veneers which the marquetry-maker can stain to suit their purpose. The first step is to draw the design, two to three times larger than the dial. Lines must be clean and precise before scaling the drawing to the required dimensions. Next, the pattern is transferred to tracing paper and the individual shapes are cut out to make templates, leaving space around the edges.
The next step is the most delicate. The marquetry-maker positions the templates on the veneer; in fact several layers of veneer, each 0.5 to 0.8mm thick. Each piece is cut from the veneer with a fretsaw. Precision is key as the saw must cut down the centre of the traced line, which is around one tenth of a millimetre thick. Cutting multiple veneers simultaneously facilities the saw-work, is useful when producing small series of dials, and can even provide "spare parts" if required. Some pieces can be scorched with a flame to create shading and depth. Following this, the pieces are assembled, like a jigsaw puzzle, and glued to the base. The finished marquetry is then fixed to the dial, lightly sanded to a perfectly smooth surface and varnished.
Wood marquetry for a watch dial calls for millimetric precision and unwavering concentration, bearing in mind that some designs comprise several hundred pieces, some no bigger than a pinhead. The most complex projects require months of work to achieve a wealth of lifelike detail. Other forms of marquetry have appeared in watchmaking in recent years, using not wood veneers but straw, feathers, stones, flower petals or a combination of materials.