Guilloché is a decoration of concentric design engraved on metal, through the use of a lathe, resulting in an elaborate pattern. These elegant and usually quite intricate designs are often covered by translucent enamels which serve to highlight the pattern. This technique was especially popular around the fin-de-siecle. Carl Faberge was a master at using guilloché and employed the technique extensively in creating his jewelry, clocks and other objects de virtu.

Also referred to as engine-turned.