Invisible setting is a jewellery setting technique in which calibre-cut gemstones are held by grooves or rails cut into the stones themselves, engaging a metal armature concealed beneath the gem layer. The result is a continuous gem surface with no metal visible between stones, a striking effect compared with conventional pavé, prong or channel settings.

History and origin

The technique is closely associated with Van Cleef & Arpels, which patented its Mystery Set process in 1933. Earlier French and German jewellers had experimented with hidden-armature settings, but Van Cleef's industrial-scale refinement of the technique made the style a hallmark of the maison and inspired imitation throughout the high-jewellery trade. The original Mystery Set used calibre-cut rubies, with sapphires and emeralds added to the repertoire in subsequent decades.

Construction

Each stone has tiny kerfs cut along its side or underside, and the metal armature has matching ridges. Stones slide onto the armature one at a time, locking laterally. The assembly is fixed from the back so that no metal element is visible from the front. Calibre cutting demands tolerances of fractions of a millimetre across many stones, and the wastage in cutting from rough is high. The technique is now used by other top-tier maisons including Cartier, Bulgari, Piaget and Boucheron, with each having its own variants and patents.