Cartier produced a significant number of pieces designed not to be worn in a single fixed way but to transform. A pair of brooches could be joined by a concealed mechanism to become a stomacher or a necklace. A tiara could be separated into a series of clips, each independently wearable. Two elements that worked as shoulder ornaments could be connected into a pendant. The conversion was typically managed by a purpose-built fastening: a screw, a sprung clip, a hidden hinge, or in one case a miniature spanner-head screwdriver supplied with the piece itself.
The appeal was partly practical. Wealthy clients who commissioned at this level wanted pieces that could appear in multiple contexts (formal balls required different configurations than drawing-room events), and a single commission that served several purposes represented better value. The engineering required to make the transformation seamless, with the piece reading as a coherent design in each configuration rather than a compromised half of something else, demanded considerable craft investment.
The Wisteria Brooches
The wisteria brooches made for Sir Ernest Cassel in 1903 are among the earliest documented examples of this approach. Two diamond and platinum sprays, each complete as a brooch, could be connected using a small screwdriver to form a stomacher, a necklace, a corsage ornament, or a tiara. Four configurations. The tool came in a case with the jewels. The piece was displayed at the V&A's major Cartier exhibition in London.
The Broader Pattern
The practice runs through the Garland Style period and into the Art Deco years. Cartier Paris produced many stomachers, corsage ornaments, and hair ornaments during this period that were explicitly designed with convertibility built in. The mechanics evolved as the styles did: the Garland Style used primarily screw and pin fastenings; the Art Deco period introduced more integrated clip systems that allowed elements to be separated and rejoined cleanly. In both cases the engineering was subordinated to the aesthetic; the mechanisms were typically invisible in wear.
Convertible jewellery of this kind is now a recognised category in auction and collector contexts. A piece that retains its original conversion tools or whose multiple configurations are documented is more complete as an object, and as a historical record, than one where the mechanism survives without the tools or the configurations are no longer demonstrable.
Sources
- Francesca Cartier Brickell, The Cartiers (Ballantine Books, 2019), ch. 5 (“Stones Paris: Early 1920s”)
