JAR, the Paris-based maison founded by the American jeweller Joel Arthur Rosenthal, is widely regarded by curators, auctioneers and the international trade as the most influential independent jeweller of the late twentieth century and the early twenty-first. Operating with deliberately limited output from a small atelier at 7 Place Vendôme, JAR has produced a body of work whose technical command, asymmetric naturalism and signature use of pavé in patinated metals has redefined what fine jewellery is understood to be.

Joel Rosenthal

Joel Arthur Rosenthal was born in the Bronx in 1943, took an undergraduate degree in art history and philosophy at Harvard in the mid-1960s, and moved to Paris before the end of that decade. After a period of teaching needlework, opening a shop with his partner Pierre Jeannet, and selling his first jewellery designs to clients including Hermes and Bulgari, he opened the JAR boutique at 7 Place Vendôme in 1977. Rosenthal trained no apprentices in the conventional sense, designed every piece himself, and built the house around a small group of bench jewellers, stone-setters and lapidaries.

Aesthetic and Working Method

The JAR vocabulary is rooted in flowers, leaves, butterflies, insects and a small range of geometric forms, executed in fine pavé over three-dimensional carved bodies. The signature technique is the gradation of colour across a surface using thousands of small calibrated stones in tones drawn from the natural model. A single butterfly, pansy or camellia might use stones of six, eight or ten distinct colours of sapphire, ruby, garnet and diamond chosen one by one for their precise hue and saturation.

Rosenthal works almost exclusively in dark-patinated alloys, particularly blackened silver over gold or silver over platinum, with the precious metal beneath the dark patina invisible to the wearer but providing structural strength and longevity. The visual logic is to remove the metal mounting from the eye entirely, allowing the carpet of stones to read as pure colour. This approach, which inverts the older convention of bright gold or platinum mountings, has become the most copied feature of his work in the international trade.

JAR pieces are not catalogued or marketed in the conventional sense. The boutique window typically shows only a single flower in a glass vase. Clients are seen by appointment, and the maison releases very little public information about its production. Auction provenance and a few authorised exhibitions remain the principal channels through which the work has become known to the wider world.

Materials

JAR is associated with several technical signatures. The use of titanium for very large pieces, particularly in the late 1990s and 2000s, allowed brooches and earrings of substantial visual scale to remain comfortable to wear. The use of patinated aluminium and patinated bronze in selected pieces was a deliberate departure from the precious-only convention. The pavé stone-setting itself reaches a density and refinement of colour gradation that has been described in the trade press as without contemporary peer.

Exhibitions

The major institutional recognition of JAR came in two exhibitions. The first, at Somerset House in London in 2002, was a small display drawn from the maison's own holdings and from a few private lenders. The second and decisive event was Jewels by JAR at the Metropolitan Museum of Art in New York from November 2013 to March 2014, the first retrospective ever granted by the Metropolitan to a living jeweller. The exhibition gathered over four hundred pieces, displayed in dim galleries with theatrical lighting at Rosenthal's insistence, and drew very large attendance and broad critical engagement.

Market

JAR pieces appear at auction infrequently and consistently outperform pre-sale estimates by significant margins. Christie's and Sotheby's have held single-owner JAR sales of major collections, and individual brooches have realised in the millions of dollars. The maison's policy of not engraving every piece with a maker's mark, of using non-precious metals in some cases, and of declining to authenticate pieces sold without provenance, has created a particular market discipline in which catalogue history and prior exhibition are decisive.

Influence

The JAR signatures, dark patinated metals, asymmetric naturalism, intense colour gradation in pavé, and the mounting of fine stones in non-precious metal supports, have entered the working vocabulary of independent fine jewellers worldwide. The work of Hemmerle in Munich, Wallace Chan in Hong Kong, and a great many smaller independents now working in patinated alloys can be read as part of an extended JAR moment in fine jewellery. The maison's chosen reticence has reinforced rather than diminished its standing.