The Hope Chrysoberyl is a historic cat's-eye chrysoberyl of approximately 45 carats that formed part of the extraordinary gem collection assembled by the London banker and connoisseur Henry Philip Hope (1774–1839) during the first decades of the nineteenth century. Renowned for the sharpness and brilliance of its chatoyant band, it stands as one of the finest documented cat's-eye chrysoberyls of the Victorian era and occupies a place in gemmological history alongside the other celebrated stones that bore the Hope name — most famously the Hope Diamond and the Hope Pearl. Together, these three objects represented the pinnacle of private gem collecting in Regency and early Victorian England, and their subsequent dispersal through inheritance disputes, sales, and bequests scattered them across the collections of Europe and, eventually, the wider world.

Henry Philip Hope and the Formation of the Collection

Henry Philip Hope was the youngest son of the Amsterdam-born merchant banking dynasty that established Hope & Co., one of the most powerful financial institutions in Europe during the late eighteenth and early nineteenth centuries. Settling in London, he devoted a substantial portion of his considerable fortune to the acquisition of paintings, decorative arts, and gemstones of exceptional quality. His gem collection, catalogued and described in the privately printed Catalogue of a Collection of Pearls and Precious Stones (1839), compiled by Benjamin Hertz, was among the most systematically documented private gem assemblages of its age. The catalogue described 296 objects and provided, for its time, unusually precise physical descriptions — including weight, colour, and optical phenomena — making it an invaluable primary source for historians of gemmology.

Hope's collecting philosophy favoured rarity and optical distinction above all else. He sought not merely large stones but stones that demonstrated phenomena or qualities beyond the reach of ordinary commerce. The Hope Diamond was prized for its extraordinary blue colour and size; the Hope Pearl for its baroque form and exceptional lustre; and the Hope Chrysoberyl for the perfection of its chatoyancy — the optical phenomenon then still imperfectly understood by science but universally admired by collectors.

Chrysoberyl and the Phenomenon of Chatoyancy

Chrysoberyl — beryllium aluminium oxide, BeAl₂O₄ — is an orthorhombic mineral with a hardness of 8.5 on the Mohs scale, making it one of the hardest gemstones in common use. Its varieties include the colour-change stone known as alexandrite and the translucent to semi-transparent material that, when cut en cabochon, displays the optical effect called chatoyancy. This effect — from the French chatoyer, to shine like a cat's eye — arises from the reflection of light by densely packed, parallel needle-like inclusions or hollow tubes oriented along the crystal's length. When a domed cabochon is cut with its base perpendicular to these inclusions, incident light reflects from them as a single, concentrated luminous band that moves across the stone's surface as the viewing angle changes.

Among all gem species capable of chatoyancy — including tourmaline, quartz, apatite, and scapolite — chrysoberyl produces the sharpest, most mobile, and most brilliantly defined cat's-eye effect, a consequence of the mineral's high refractive index (approximately 1.746–1.763) and the exceptional regularity with which its fibrous inclusions are aligned. The finest cat's-eye chrysoberyls have historically come from the gem gravels of Sri Lanka (then Ceylon), with notable material also recovered from Brazil and, more recently, India. Sri Lankan material, in particular, has long been associated with the finest colour — a warm, honey-yellow to greenish-yellow body colour — and the sharpest eye.

The phenomenon was sufficiently rare and striking in the early nineteenth century that fine cat's-eye chrysoberyls commanded prices comparable to those of fine rubies or sapphires of equivalent size. A 45-carat example displaying a sharp, well-centred band would have been, by any contemporary standard, an object of the first rank.

Description and Gemmological Character

The Hertz catalogue of 1839 described the Hope Chrysoberyl in terms that emphasise both its size and the quality of its optical phenomenon. At approximately 45 carats — a weight that places it among the largest documented cat's-eye chrysoberyls of its era — the stone was cut as a high-domed cabochon, the form universally employed to maximise the chatoyant effect. Contemporary descriptions suggest a body colour in the warm yellow to yellowish-green range characteristic of the finest Sri Lankan material, though the precise origin of the stone was not recorded with the certainty that modern provenance research would require.

The defining characteristic of a fine cat's-eye chrysoberyl is the quality of its eye: ideally, the band should be sharp-edged rather than diffuse, perfectly centred on the dome, white or silvery in colour, and highly mobile — shifting crisply as the stone is rotated. The finest examples also display the so-called milk and honey effect, in which one half of the stone appears lighter (milky) and the other darker (honey-coloured) when illuminated from a single directional source, a consequence of differential reflection from the fibrous inclusions. The Hope Chrysoberyl's reputation, as conveyed through the Hertz catalogue and subsequent references in Victorian gemmological literature, suggests it possessed these qualities to an exceptional degree.

No modern gemmological laboratory report for the Hope Chrysoberyl is known to exist in the public record, as the stone's whereabouts following the dispersal of the Hope Collection have not been established with certainty. This absence of a documented chain of custody from the mid-nineteenth century to the present distinguishes it from the Hope Diamond, which passed through a sequence of well-documented owners before entering the Smithsonian Institution in 1958.

The Dispersal of the Hope Collection

Henry Philip Hope died in 1839 without legitimate issue, leaving his estate — including the gem collection — to his nephews. The collection became the subject of protracted legal and familial dispute among the Hope heirs, a situation that was not uncommon among large Victorian estates of this complexity. The gem collection was eventually inherited by Henry Thomas Hope, who retained much of it until his own death in 1862, after which it passed to his daughter Henrietta and her husband, the sixth Duke of Newcastle. The collection was subsequently broken up through a series of sales in the latter decades of the nineteenth century.

The Hope Diamond was sold in 1901 to the London dealer Weston and subsequently passed through the hands of several notable owners — including the American socialite Evalyn Walsh McLean — before its donation to the Smithsonian. The Hope Pearl was sold at Christie's in London in 1886. The Hope Chrysoberyl's post-collection history is considerably less well documented. Unlike the diamond, which attracted continuous public attention owing to its colour, size, and the mythology that accumulated around it, the chrysoberyl — though gemmologically exceptional — did not generate the same degree of journalistic or institutional interest, and its trail in the auction and dealer records of the late nineteenth and early twentieth centuries is difficult to follow with confidence.

It is possible that the stone entered a private European collection and remained there without further public documentation, a fate common to many important gems of the period. The absence of a confirmed modern location should not be taken as evidence that the stone no longer exists; rather, it reflects the incomplete nature of gem provenance records from this era.

Significance in the History of Gemmology

The Hope Collection as a whole occupies a foundational position in the history of systematic gem collecting and documentation. The Hertz catalogue of 1839 was one of the earliest attempts to apply consistent descriptive criteria — weight, colour, optical character, and comparative assessment — to a private gem collection, anticipating the more rigorous methodologies that would emerge with the establishment of the Gemmological Institute of Great Britain (later the Gemmological Association of Great Britain, or Gem-A) in 1908 and the Gemological Institute of America in 1931. In this sense, the Hope Chrysoberyl is significant not only as a physical object but as a documented specimen in the early literature of gemmology.

The stone also reflects the particular fascination that optical phenomena held for nineteenth-century collectors. In an era before electric lighting, the behaviour of a fine cat's-eye under candlelight or gaslight would have been a source of genuine wonder — the luminous band shifting and contracting as the stone moved, appearing almost animate. This quality made cat's-eye chrysoberyl one of the most prized gem varieties among European collectors of the Regency and Victorian periods, and the Hope example, at 45 carats with a reportedly exceptional eye, would have been considered a supreme exemplar of the type.

The broader Hope Collection also contributed to the cultural mythology of gemstones in the English-speaking world. The supposed curse associated with the Hope Diamond — a narrative largely constructed by journalists and dealers in the early twentieth century rather than by any documented historical tradition — has tended to overshadow the other Hope stones in popular consciousness. The chrysoberyl and the pearl, lacking such dramatic narratives, have received comparatively little attention outside specialist gemmological literature, despite their intrinsic importance.

Cat's-Eye Chrysoberyl in the Market

Fine cat's-eye chrysoberyl has remained among the most consistently valued of all phenomenal gemstones. In the contemporary market, stones above 10 carats with a sharp, well-centred eye and good body colour command significant premiums, and examples above 20 carats of fine quality are genuinely rare. A stone of 45 carats with the qualities attributed to the Hope Chrysoberyl would, if it were to appear at auction today with documented provenance, represent an exceptional offering by any measure.

The principal value factors for cat's-eye chrysoberyl — as established by the trade and by gemmological authorities including the GIA — are the sharpness and centrality of the eye, the body colour (with honey-yellow to yellowish-green being most prized), the degree of translucency, and the presence or absence of the milk and honey effect. Treatments are relatively uncommon in chrysoberyl compared with corundum or beryl, though fracture filling and surface coating have been documented in lower-quality material. There is no indication in the historical record that the Hope Chrysoberyl was treated in any way, though the analytical techniques to confirm this were, of course, unavailable in Hope's lifetime.

Sri Lanka remains the primary source of the finest cat's-eye chrysoberyl, with the gem gravels of the Ratnapura and Elahera districts producing material of the quality associated with the Hope stone. Brazilian material tends toward a slightly different colour range, and Indian production, centred in Andhra Pradesh, has contributed significantly to supply since the latter twentieth century.

Legacy

The Hope Chrysoberyl endures as a benchmark in the history of phenomenal gemstones — a documented example of what cat's-eye chrysoberyl can achieve at its finest, preserved in the gemmological record through the Hertz catalogue even as the physical stone itself has passed from public view. It serves as a reminder that the Hope Collection was not merely a setting for the famous blue diamond but a comprehensive and discerning assemblage in which each object was selected for its own exceptional qualities. For the student of gemmology and the historian of collecting alike, the Hope Chrysoberyl represents an important, if incompletely documented, chapter in the long relationship between human culture and the optical wonders of the mineral world.

Further Reading

• GIA — Cat's-Eye Chrysoberyl
• GIA — Chrysoberyl Overview
• Smithsonian Institution — The Hope Diamond