The phrase "Asprey JAR" places two very different but equally significant names within the orbit of British jewellery culture. Asprey — the venerable Bond Street house founded in 1781 — represents the long arc of English luxury craftsmanship, royal patronage, and institutional prestige. JAR — the initials of Joel Arthur Rosenthal, the American-born, Paris-based jeweller who has operated quietly from the Place Vendôme since 1978 — represents perhaps the most singular artistic intelligence working in jewellery today, one whose connection to the British market and British collectors is deep, even if his aesthetic owes more to Mughal India and the Impressionist palette than to the English tradition. Together they illuminate the breadth of what "fine jewellery" can mean: the grandly institutional and the fiercely individual, the publicly celebrated and the deliberately obscure.

Asprey: The Bond Street Inheritance

Asprey was established in 1781 by William Asprey in Mitcham, Surrey, initially as a fabric-printing business. The family relocated to London, and by the early nineteenth century the firm had evolved into a purveyor of luxury goods — leather, silver, clocks, and jewellery — from premises on New Bond Street. The address at 165–169 New Bond Street, which the house occupied for much of the nineteenth and twentieth centuries, became one of the most recognisable retail addresses in the world, its dark green shopfront and gilded lettering a fixture of Mayfair life.

The firm accumulated royal warrants with a consistency that few houses have matched. At various points Asprey held warrants from Queen Victoria, King Edward VII, King George V, King George VI, and Queen Elizabeth II, as well as from the Prince of Wales. This succession of warrants was not merely ceremonial: it reflected genuine patronage, with the royal family purchasing gifts, presentation pieces, and personal jewellery from the house across generations. The warrant system in Britain carries real commercial and reputational weight, and Asprey's unbroken chain of royal association gave it an authority that competitors could not easily replicate.

Asprey's jewellery output across the Victorian and Edwardian periods was characterised by high technical accomplishment rather than radical innovation. The house excelled in the idioms of its time — diamond rivieres, seed-pearl work, enamel lockets, and the elaborate gold and gem-set suites that Edwardian society demanded for court presentation and country-house entertaining. Its silversmiths and goldsmiths worked to the highest London standards, and the firm maintained its own workshops, a distinction that set it apart from retailers who merely bought in finished goods.

The twentieth century brought both glory and turbulence. Asprey's Art Deco pieces from the 1920s and 1930s — platinum-set diamond bracelets, onyx and coral combinations, geometric brooches — are now collected seriously and appear regularly at major auction. The post-war decades saw the house expand its product range into leather goods, crystal, and gifts, broadening its appeal but also diluting the jewellery focus that had defined its finest periods. A series of ownership changes in the late twentieth and early twenty-first centuries — including a period under the Asprey & Garrard umbrella following the 1998 merger with the Crown Jeweller Garrard, and the subsequent separation of the two brands in 2002 — created instability that the house has worked to resolve. Under the ownership of the Mahfouz family from the early 2000s, Asprey returned to its Bond Street roots and recommitted to bespoke jewellery and silversmithing.

Today Asprey operates from its flagship at 167 New Bond Street, a building redesigned by Norman Foster in 2004, and maintains a presence in New York, Beverly Hills, and select international markets. Its bespoke jewellery commissions, particularly in coloured gemstones and high-carat diamonds, continue to attract serious collectors, and the archive of historic pieces provides a foundation for scholarly and curatorial engagement with the British jewellery tradition.

The Gemmological Character of Asprey Jewellery

Asprey's historic jewellery is distinguished by its use of the finest available materials combined with restrained, technically impeccable setting. Victorian and Edwardian pieces frequently feature old-mine and old-European-cut diamonds of high colour and clarity, set in silver-topped gold or, from the Edwardian period onward, in platinum. Coloured stones — Burmese rubies, Kashmir sapphires, Colombian emeralds, and Ceylonese sapphires — appear in the more important pieces, often in calibré-cut form within millegrain-edged mounts that are characteristic of the period's London work.

The firm's use of enamel, particularly in its smaller decorative objects and jewellery, reflects the influence of the Arts and Crafts movement and the broader European enamel revival of the late nineteenth century, though Asprey's approach remained more conservative than that of, say, René Lalique or the Wiese workshop in Paris. Guilloche enamel on gold, frequently in translucent blue or green, appears on cigarette cases, vinaigrettes, and small brooches that are now keenly sought by collectors of English decorative arts.

For the collector or gemmologist examining an Asprey piece, hallmarks are the primary tool of attribution. London hallmarks on gold and platinum pieces, combined with the Asprey maker's mark (typically registered at the London Assay Office), allow confident dating and attribution. The house's records, though not fully public, have been consulted by auction specialists at Christie's, Sotheby's, and Bonhams in preparing catalogue notes for significant pieces.

JAR: Joel Arthur Rosenthal and the Jewellery of Pure Vision

Joel Arthur Rosenthal was born in New York in 1943 and studied art history at Harvard University, graduating in 1964. He arrived in Paris in the late 1960s, initially working in the antiques trade, and in 1978 opened JAR at 7 Place Vendôme — one of the most charged addresses in the jewellery world, surrounded by the ateliers of Cartier, Van Cleef & Arpels, Boucheron, and Chaumet. The choice of address was not accidental: Rosenthal understood that to be taken seriously in the highest tier of jewellery, one had to occupy the correct geography. Yet almost everything else about JAR defied convention.

The boutique has no sign visible from the street. There is no advertising, no catalogue, no website, and no public price list. Clients are received by appointment only, and the appointment itself is not easily obtained: new clients typically require an introduction from an existing client. Pieces are made in strictly limited numbers — some designs exist in only one or two examples — and are almost never sold at auction by the house itself, though JAR pieces do appear on the secondary market, where they command prices that reflect both their rarity and their extraordinary technical and artistic quality.

This deliberate obscurity is not affectation. It reflects Rosenthal's conviction that jewellery at the highest level is a private art form, a dialogue between maker and wearer rather than a public spectacle. He has given very few interviews, and those he has given are notable for their precision and their refusal of the promotional language that characterises most luxury discourse.

The Aesthetic and Technical Language of JAR

JAR jewellery is immediately recognisable to those who have encountered it, yet almost impossible to describe adequately in words — a paradox that Rosenthal himself has acknowledged. Several characteristics define the work.

The use of pavé setting — specifically a form of micro-pavé in which stones are set so closely and so precisely that the metal beneath becomes nearly invisible — is central to JAR's visual language. Rosenthal achieves colour effects that are closer to painting than to conventional jewellery: gradations from deep violet through lilac to pale lavender, or from the saturated green of chrome tourmaline through yellow-green to pure yellow, achieved by mixing stones of subtly different hue and tone within a single surface. The effect is impressionistic in the literal sense — it recalls the broken-colour technique of the French Impressionists — and it is technically demanding to a degree that few other workshops in the world can approach.

The stones Rosenthal selects are chosen with a gemmologist's rigour and a painter's eye simultaneously. He is known to use spinels, garnets of all varieties (including the rare colour-change garnets from East Africa), demantoid garnets, alexandrite, fine sapphires, rubies, and emeralds, as well as less conventional materials including coloured diamonds, fine opals, and occasionally organic materials. The criterion is always colour quality and optical character rather than conventional prestige: a fine Mahenge spinel or a vivid chrome tourmaline will be preferred over a mediocre ruby of greater commercial value.

Structurally, JAR pieces often employ unexpected engineering: flowers whose petals tremble on concealed springs (en tremblant work of exceptional refinement), brooches whose apparent fragility conceals robust internal armatures, and rings whose shanks are engineered to distribute weight in ways that allow very large stones to be worn in comfort. The metalwork is typically in silver or a silver-gold alloy rather than the yellow gold or white gold that dominates conventional high jewellery, a choice that keeps the metal subordinate to the stones and avoids the visual weight that yellow gold can impose.

JAR and the British Connection

Although JAR is a Paris house, its relationship with British collectors and British cultural institutions is significant. The 2002 exhibition Jewels by JAR at Somerset House in London — the first major public exhibition of Rosenthal's work — was a landmark event in the history of jewellery exhibition. Organised with the cooperation of private collectors (the pieces on display were almost entirely borrowed from their owners rather than from the maker), the exhibition introduced JAR's work to a broader public for the first time and was received with critical admiration that crossed the boundary between the jewellery world and the mainstream art press.

A subsequent exhibition at the Metropolitan Museum of Art in New York in 2013 confirmed JAR's status as an artist whose work belongs in museum contexts, but the Somerset House show remains the more intimate and in some ways more revealing event, precisely because it took place in London, among a collector community that had been among JAR's earliest and most devoted patrons. British collectors — particularly those with connections to the worlds of art dealing, fashion, and aristocratic patronage — had recognised Rosenthal's work from an early stage, and several of the most important JAR pieces in private hands are in British collections.

Asprey and JAR: Points of Contrast and Convergence

The juxtaposition of Asprey and JAR illuminates the range of possibilities within the category of fine jewellery. Asprey represents the institutional model: a house with a public identity, a retail presence, a long history of royal and aristocratic patronage, and a product range that extends from bespoke commissions to accessible luxury goods. JAR represents the atelier model in its most extreme form: a single creative intelligence, no public identity, no retail in any conventional sense, and a body of work so limited in quantity that ownership of a piece is itself a form of connoisseurship.

Both, however, share a commitment to material quality that places them outside the mainstream of commercial jewellery. Asprey's historic pieces, when examined gemmologically, consistently reveal the use of fine-quality stones acquired through the best available channels of their period. JAR's stones are selected with an intensity of focus that is arguably unmatched in contemporary jewellery. In both cases, the jewellery is made for people who understand what they are looking at — or who trust, implicitly, that those who made it do.

The secondary market treats both names with respect. Asprey pieces from the Victorian, Edwardian, and Art Deco periods appear regularly at Christie's, Sotheby's, and Bonhams, where they are catalogued carefully and attract strong bidding from collectors of English jewellery and decorative arts. JAR pieces, when they appear at auction — which is infrequent, since many owners are reluctant to sell — achieve prices that reflect their extreme rarity and the intensity of collector demand. A JAR brooch or ring is not merely a piece of jewellery; it is, in the estimation of those who follow the field closely, a work of art in the fullest sense of that phrase.

Further Reading

• GIA Gems & Gemology — JAR Jewels at the Metropolitan Museum of Art (Spring 2014)
• GIA — Asprey and the Bond Street Tradition