En tremblant
En tremblant is a French term for jewellery elements mounted to quiver as the wearer moves. Moving flowerheads on brooches are a typical example. Fine springs or slender metal wires produce the effect.
Recognising the construction
Lang Antiques documents this arrangement in diamond floral jewellery of the eighteenth and nineteenth centuries. Mozeris illustrates a floral brooch dated to around the 1870s with spring-mounted flowerheads. The term identifies a mounting method, not a particular gemstone cut, metal fineness or maker. A pendant swinging from a simple ring is therefore not automatically an en tremblant construction.
Condition assessment
Look beneath the motif for its supports and springs. Record blocked movement, missing components and visible repairs. Do not bend or stretch a spring to demonstrate the effect. An assessment should document both the decorative composition and the condition of the moving mechanism. An immobilised element may need specialist examination before it is described as originally rigid.
Sources: Lang Antiques: En Tremblant, dokumentert blomsterbrosje; Mozeris: egen dokumentert tremblant-brosje.
