BAYCO is a New York-based high jewellery house founded in 1980 by the Hadjibay family, operating by private appointment from its base in Manhattan. The firm occupies a singular position within the international coloured-gemstone trade: it is neither a retail jeweller in the conventional sense nor a wholesale dealer, but rather a specialist atelier whose entire identity is built around the acquisition, mounting, and private placement of gemstones of exceptional rarity — principally unheated Burmese rubies, Kashmir sapphires, Colombian emeralds, and other stones of the highest documentary provenance. BAYCO's clientele is drawn from private collectors, royal families, and institutions worldwide, and the house has been associated with some of the most significant coloured-stone transactions of the past four decades, including the celebrated Sunrise Ruby, which realised CHF 28.255 million (approximately USD 30.3 million) at Sotheby's Geneva in May 2015, setting a world auction record for a ruby and for any coloured gemstone per carat at that time.

Origins and the Hadjibay Family

The Hadjibay family's involvement in the gemstone trade predates the founding of BAYCO by at least a generation. The family's roots lie in the broader Sephardic and Middle Eastern jewellery-trading networks that have long connected the gem-producing regions of Asia with the luxury markets of Europe and North America. When BAYCO was formally established in 1980, it did so with an already deep understanding of origin-specific coloured stones — particularly those from Burma (present-day Myanmar) and Kashmir — at a moment when the international trade was beginning to formalise the premium attached to unheated, origin-certified material.

This timing proved consequential. Through the 1980s and 1990s, as major gemmological laboratories including the Gübelin Gem Lab in Lucerne and the Swiss Gemmological Institute (SSEF) in Basel developed and refined their methodologies for detecting heat treatment and determining geographic origin, BAYCO was already building a inventory philosophy centred on stones that could withstand — and benefit from — precisely that level of scrutiny. The house became known within the trade for its willingness to submit stones to multiple leading laboratories and to present documentation transparently to prospective clients.

Philosophy: Rarity, Provenance, and the Unheated Standard

The defining characteristic of BAYCO's commercial and aesthetic philosophy is an insistence on gemstones that require no enhancement to achieve their colour. In the coloured-gemstone trade, heat treatment is ubiquitous: the overwhelming majority of rubies and sapphires offered commercially have been subjected to high-temperature processes that improve colour saturation, reduce silk (rutile needles), and clarify the stone's appearance. Such treatment, when properly disclosed, is broadly accepted by the trade and by the major auction houses. However, stones that achieve comparable or superior colour in their natural, unheated state represent a vanishingly small fraction of production and command substantial premiums — premiums that have grown markedly since the early 2000s as collector awareness has increased.

BAYCO's focus on this category of material means that the house operates in a market defined by extreme scarcity. A fine unheated Burmese ruby of five carats or more with credible laboratory documentation is, in any given year, among the rarest objects in the luxury market. The house's ability to source such stones consistently over more than four decades reflects both long-standing relationships within the supply chain — including connections to Burmese trading families, Antwerp dealers, and estate sources — and the financial capacity to hold significant inventory over extended periods while awaiting the appropriate private placement.

The Sunrise Ruby

No single stone has done more to bring BAYCO to wider public attention than the Sunrise Ruby. The stone — a Burmese ruby of 25.59 carats, cushion-shaped, set by BAYCO in a ring flanked by two shield-shaped diamonds — was certified by the Gübelin Gem Lab and the SSEF as natural, unheated, and of Burmese origin. Its colour was described in laboratory reports as consistent with the benchmark pigeon's blood designation, a term formalised by the major Swiss laboratories to describe the most saturated, slightly fluorescent red associated with Mogok Valley production.

When the ring was offered at Sotheby's Geneva on 12 May 2015, it achieved CHF 28.255 million against a pre-sale estimate of CHF 12–18 million, establishing a world record for a ruby at auction and, at the time, for any coloured gemstone on a per-carat basis. The result was widely reported in the financial and luxury press and served to crystallise, in a single transaction, the extraordinary value that the market had come to attach to unheated Burmese rubies of the finest quality. The Sunrise Ruby remains the most prominent single stone associated with BAYCO's name in the public record.

Kashmir Sapphires and the Blue Counterpart

If Burmese rubies define one axis of BAYCO's identity, Kashmir sapphires define the other. The sapphire mines of the Zanskar Range in the Padar district of Kashmir — active primarily between the 1880s and the early twentieth century, with only intermittent production thereafter — yielded a body of material whose velvety, cornflower-blue colour has never been replicated by any other deposit. Kashmir sapphires of significant size and quality are, if anything, rarer than comparable Burmese rubies: the mines are largely exhausted, and the existing supply is almost entirely in the secondary market, dispersed among estates, private collections, and the inventories of a small number of specialist dealers.

BAYCO has consistently maintained a presence in this market. The house has handled Kashmir sapphires across a range of sizes and qualities, and its expertise in evaluating the subtle distinctions within Kashmir material — the degree of velvety light scattering, the presence or absence of silk, the precise hue angle — is regarded within the trade as among the most refined available outside the major gemmological laboratories themselves. The house's approach to Kashmir sapphires mirrors its approach to Burmese rubies: prioritise unheated material, insist on documentation from the leading Swiss laboratories, and present stones within jewellery settings that complement rather than compete with the stone's natural character.

Design and the Jewellery Atelier

BAYCO's jewellery design vocabulary is deliberately classical. The house does not pursue avant-garde or conceptually driven aesthetics; its settings are conceived to serve the gemstone rather than to assert an independent design identity. This approach reflects a considered position: when the central stone is a 20-carat unheated Burmese ruby or a 15-carat Kashmir sapphire, the jeweller's primary obligation is to present that stone in conditions of maximum optical advantage — appropriate metal colour, sympathetic diamond accompaniment, and a silhouette that reads clearly at the distances at which fine jewellery is typically viewed.

In practice, this has produced a body of work characterised by platinum and high-carat gold settings, brilliant-cut and fancy-cut diamond surrounds, and forms — rings, necklaces, brooches, earrings — that draw on the traditions of mid-twentieth-century high jewellery without being strictly historicist. The Sunrise Ruby ring, with its cushion-cut ruby flanked by shield-shaped diamonds in a platinum mount, is representative: elegant, proportionate, and entirely subordinate to the stone it carries.

Operating Model and Clientele

BAYCO does not maintain a public retail presence. The house operates by private appointment, a model that reflects both the nature of its inventory — stones and jewels whose values run from the hundreds of thousands to the tens of millions of dollars — and the preferences of its clientele. Private collectors, members of ruling families in the Gulf states and Southeast Asia, and a smaller number of Western collectors form the core of the house's client base. The private-appointment model also allows BAYCO to function as an advisory resource: clients seeking to acquire significant coloured stones at auction, or to authenticate and value inherited material, engage the house for its expertise as much as for its inventory.

Within the trade, BAYCO is known for its participation in the major international gem and jewellery fairs, including the Baselworld watch and jewellery show (during the years of that fair's operation) and private events associated with the major auction seasons in Geneva and New York. The house maintains relationships with Sotheby's, Christie's, and Bonhams, and has consigned material to all three houses over the course of its history.

Significance Within the Coloured-Gemstone Market

BAYCO's four-decade history coincides almost exactly with the period during which the market for unheated, origin-certified coloured gemstones matured from a specialist concern into a mainstream luxury category. In the early 1980s, the premium attached to unheated material was acknowledged within the trade but was not yet systematically reflected in auction results or retail pricing. By the 2020s, that premium — for the finest Burmese rubies and Kashmir sapphires — had become one of the most significant value differentials in the entire luxury market, with unheated stones of comparable quality routinely achieving multiples of two to five times the price of heated equivalents.

BAYCO did not create this market, but the house has been among its most consistent and visible participants, and its association with landmark stones such as the Sunrise Ruby has contributed materially to collector education and market confidence. The house's insistence on laboratory documentation, its long-standing relationships with the Gübelin Gem Lab and SSEF, and its willingness to present provenance transparently have helped establish standards of disclosure that have gradually become normative across the high-end coloured-gemstone trade.

For gemmologists, collectors, and students of the jewellery market, BAYCO represents a case study in the commercial and aesthetic possibilities of extreme specialisation: a house that has built a durable and internationally recognised identity not through volume or breadth, but through an unwavering focus on the rarest material within a single, demanding category.

Further Reading

• GIA Gems & Gemology — Ruby Market Overview
• GIA Gems & Gemology — Kashmir Sapphire
• Lotus Gemology — Ruby Heat Treatment