The Corning Ewer

A pear-shaped glass ewer, 16 centimetres high, cut from a colorless blank cased in transparent light-green glass so that two confronted birds of prey attacking two horned quadrupeds stand out in relief. It is repeatedly described as the finest known and most complete example of Islamic cameo glass, a technique attempted for only about two centuries in the early Islamic world and now represented almost everywhere else by fragments.

Where it was made is not settled. It surfaced on the art market in Tehran, entered Edmund de Unger's Keir Collection in England by the mid-1970s, and was bought by the Corning Museum of Glass in 1985. Nothing in that chain, and nothing in the scientific testing done on the glass itself, resolves whether it is Iranian or the product of a Fatimid Egyptian workshop cutting glass in imitation of the rock-crystal ewers made for the Fatimid court in Cairo.

Its rarity is real and also part of the problem: because so little cameo glass of this class survives intact, there is no second complete example to check any attribution against, only fragments and one badly damaged sibling in London.

What it is

The Corning Ewer stands 16 centimetres high with a maximum diameter of 9.3 centimetres: a small pear-shaped vessel with a flaring neck, an oval mouth with a pouring lip, and a thin ribbon handle rising from the lower body to the rim. It was built as cased glass, a colorless body blown and then coated in a second, thinner layer of transparent light-green glass. Almost all of that green layer was then cut away, left standing only where the design required it, so that the decoration reads as green relief against a colorless ground.

The design is a band of confronted animals running around the body: two birds of prey, rendered in a stylised, almost heraldic manner, attack two horned quadrupeds that face each other, with two further birds perched in stylised tree branches behind the confrontation. The scheme repeats with the rhythmic, all-over patterning typical of luxury objects of the early Islamic courts. The body carries a network of old, mended cracks visible in every published photograph of the piece; no conservation report describing that repair work was located for this record.

How it was cut

Cameo glass is cold work. The two-layer blank was allowed to cool to room temperature, and the outer green layer was then cut away with a rotating wheel and a sharply pointed tool, the same lapidary approach used across Islamic relief-cut and engraved glass of this period, rather than any hot-working technique. It is exacting, slow, and unforgiving: a single slip removes material that cannot be put back.

The technique of cutting a colored outer skin away from a colorless or differently colored body to leave figures standing proud is older than Islamic glassmaking. Its most famous ancient exponents were Roman, and the most celebrated surviving Roman example, the Portland Vase, is already a separate record in this corpus at a much earlier date and from an unrelated tradition. Islamic glassworkers of the 9th to 11th century picked the method up again after a long gap in its practice, and did so as part of a wholly separate artistic and technical culture, with its own repertoire, its own workshops, and no documented chain of transmission linking a Roman cutter to an Islamic one. A second, much later revival of cameo cutting happened in 19th and early 20th century France, in the work of makers such as Daum and Galle, also already recorded separately in this corpus; that revival is closer in time to the present than to this ewer, and drew on its own set of models. The Corning Ewer's place in the history of cameo glass is the middle term: a genuinely separate Islamic tradition, related to the other two only by a shared cutting principle, not by any continuous lineage.

Where it was made: two positions, neither settled

Scholarship splits on the ewer's place of manufacture, and the split runs through the entire small class of objects it belongs to.

The case for Iran rests on association: a pitcher, a bowl, and a cup of comparable cameo-cut work are attributed to Iran, and the ewer itself surfaced on the market in Tehran, as did the Buckley Ewer, its closest surviving parallel, now in London. Circumstantial evidence of where an object was bought is not evidence of where it was made, and the reviewer of David Whitehouse's 2010 Corning catalogue of Islamic glass makes exactly that point about the volume's broader habit of defaulting to Iran: for the catalogue's scratch-engraved wares, the same reviewer notes that other scholars, including Stefano Carboni and Jens Kroger, have argued for an origin further west, in Syria, against Whitehouse's Iranian attributions. That specific argument concerns a different technical class of glass, not the cameo-cut ewers, but it is a documented instance of the same default label being challenged elsewhere in the same book, and it is a reason for caution rather than confidence.

The case for Egypt rests on close comparison to a different medium entirely: the rock-crystal ewers cut for Fatimid rulers in Cairo, of which the Corning Ewer and the Buckley Ewer are argued to be glass versions, cut in imitation of harder and more expensive quartz. In 1930 Carl Johan Lamm concluded, on the basis of relief-cut and cameo-glass fragments excavated at Samarra in Iraq, that the rock-crystal ewers were produced either in Iraq or in Egypt under strong Iraqi influence; the Victoria and Albert Museum's own catalogue entry for the Buckley Ewer hedges between Iraq and Iran while noting the Cairo-workshop possibility for its form. No named scholar in the sources consulted for this record argues for Egypt on documented archival grounds; the case is technical and stylistic comparison, not a paper trail.

Whitehouse tried to settle the question physically. He compared the ewer's own ultraviolet fluorescence, under both shortwave and longwave light, against reference fragments of colorless plant-ash soda glass recovered from known Egyptian and known Iranian sites. The Corning Ewer's colorless body fluoresced brownish-orange under shortwave and greenish-yellow under longwave, with little or no reaction from the green overlay. The Egyptian and Iranian reference groups both fluoresced pinkish-orange under shortwave and yellow under longwave; that is, the two supposedly rival source regions gave the same result as each other, and the ewer matched neither of them. The test did not fail to distinguish Egypt from Iran; it failed to place the ewer in either group at all. This record states both positions and does not choose between them.

A date that will not narrow

The ewer is conventionally dated to around AD 1000, and is described in the Corning Museum's own framing as early 10th century. Whitehouse's 2010 catalogue of the Corning collection's Islamic cut and engraved glass, of which this ewer is the single outstanding piece, dates its objects across the 8th to the 11th century as a group, and its reviewer notes that individual dates in the catalogue typically span two centuries rather than narrowing to one, because so much of the material lacks a controlled excavation context.

A closely comparable ewer of the same subject and technique, sold at Bonhams in London in 2025, illustrates why the range refuses to close. On stylistic grounds it was catalogued as late 10th or early 11th century; compositional analysis of its glass by Julian Henderson, however, was reported as consistent with production in around the 9th century or slightly later, a result that pulls in the opposite direction from the stylistic date. Where independent scientific dating exists for this class of object at all, it does not agree with the typology, and no comparable scientific dating study of the Corning Ewer's own glass composition was located for this record. The range stays wide because nothing has yet forced it narrower.

What "found near Tehran" actually means

This record has deliberately not called Tehran a findspot. The only documented statement located for this record is that the ewer was acquired by the collector Edmund de Unger in Tehran, reported in a scholarly review of Whitehouse's 2010 catalogue. That is a description of where a purchase was made, not of where an object was dug up, and the two are routinely conflated in market-sourced Islamic art of this period.

No excavation report, no findspot coordinates, no export documentation, and no named dealer for the Tehran transaction were located in the sources consulted for this record. Whether the ewer came from a controlled or informal excavation, from an existing private Iranian collection, or from the antiquities trade with no documented findspot at all, is simply not stated anywhere this record could verify. Reporting it as a clean archaeological find would overstate what is actually known, and the honest position is that the object's find history is undocumented beyond the fact of a market transaction in Tehran.

From Tehran to Corning

The documented chain begins with Edmund de Unger, a Hungarian-born property developer who settled in England, built the Keir Collection into one of the major post-war private collections of Islamic art, and founded the Islamic Art Circle in London in 1964. The Corning Ewer was in his collection, at Ham in Surrey, by 1976, when it was lent to The Arts of Islam, the major loan exhibition held at the Hayward Gallery in London from 8 April to 4 July 1976, catalogued by Dalu Jones and George Michell for the Arts Council of Great Britain.

It remained with de Unger until the Corning Museum of Glass acquired it in 1985, using funds from the Clara S. Peck Endowment; the accession number 85.1.1 records the year. How the object passed from de Unger to Corning, whether by direct sale, through a dealer acting for either party, or by some other route, is not stated in any source consulted for this record. The Keir Collection as a whole was later bequeathed by de Unger in 2008 to the Pergamon Museum of Islamic Art in Berlin, and is now on long-term loan to the Dallas Museum of Art; the Corning Ewer left the collection well before that bequest and is not part of it.

The birds and the horned beasts

No inscription, contract, or record of commission survives to say what the ewer's imagery meant to whoever ordered it. What can be said rests on comparison rather than testimony. The confrontation of a bird of prey with a horned quadruped is an old motif in the art of greater Iran: a comparable image appears on a Sasanian seal now in the British Museum, predating the ewer by centuries, and animal-combat scenes of this general kind run continuously through Sasanian and post-Sasanian decorative art in metalwork, textiles, and glyptic seals before reappearing here on glass.

That continuity is a documented stylistic fact, not evidence of a specific doctrinal or courtly programme attached to this particular vessel. There is no known patron, no known findspot context, and no textual source connecting this ewer to a stated occasion or belief. The plainest and most defensible reading is that its maker drew on a long-available decorative repertoire of princely luxury imagery, used here as it was used elsewhere, without a documented deeper meaning specific to this object. That absence is itself worth recording rather than papering over with a symbolism the sources do not support.

The vivid figural imagery is also worth noting for what it is not: evidence against blanket claims that Islamic art avoided figuration. Aniconism in Islamic visual culture was, and is, primarily a matter of religious context; secular luxury objects made for courtly and domestic use, in glass, metalwork, and ivory, carried figural and animal imagery throughout the period this ewer belongs to. Nothing about its imagery required special explanation in its own time so far as the sources for this record show.

How rare is "finest and most complete"

The claim that this is the finest known and most complete example of Islamic cameo glass is repeated across the literature this record could check, and it holds up reasonably well against what else survives, though it is worth setting out exactly what it is being measured against.

The closest whole comparable object is the Buckley Ewer in the Victoria and Albert Museum, named for a previous owner, Wilfrid Buckley, and given to the museum by his widow. It shares the same pear-shaped form and a thumb-rest modelled as two small birds, and is catalogued by the V&A itself as glass, blown and wheel-cut, of Iraq or Iran, possibly from a Cairo workshop; but it is colorless throughout, not cased in a second color, and survives only as a heavily fragmented reconstruction, considerably more broken than the Corning vessel. It is a close relative in form and in the underlying attribution dispute, not a rival for completeness.

The hard-stone version of this same ewer type is better represented: rock-crystal ewers cut for the Fatimid court survive in London (Victoria and Albert Museum, 1000-1050) and in Copenhagen (The David Collection, Egypt, about 1000), among others, and Wikipedia's account of the type, citing a popular history of the Fatimid treasury, puts the number of surviving early Islamic carved rock crystals at around 200 worldwide, with most Fatimid court holdings lost when the treasury was dispersed during the crisis of the 1060s to early 1070s. That figure and that date range are given here as reported, from a source this record treats as tertiary and flags for replacement with Anna Contadini's specialist study of Fatimid rock crystal, which could not be independently checked for this record.

Cameo-cut glass proper is rarer still, and mostly fragmentary: a three-layer cameo fragment from Nishapur, with an opaque white middle layer, a more complex sandwich than the Corning Ewer's plain two-layer body, is in the Metropolitan Museum of Art. A cameo ewer of strikingly similar subject and technique, birds of prey attacking horned quadrupeds on a two-layer green-over-colorless body, was sold at Bonhams in London on 22 May 2025 for a total price of GBP 89,300 including buyer's premium; the hammer price alone was not published in the source consulted. That ewer's own catalogue entry cites both the Corning Ewer and the Buckley Ewer as comparanda, which is the clearest evidence available that this is a small, related group of surviving objects rather than a unique one, and that the Corning Ewer is judged the best-preserved and most fully worked member of it.

What is still unresolved

The two live questions are the same two the object has carried since it entered a public collection: where it was made, and how precisely it can be dated. Neither has moved in the literature consulted for this record. What has moved, comparatively little discussed, is the honesty of the find history: an object bought in Tehran is not thereby an object excavated in Iran, and the gap between those two claims is exactly the gap this record has tried to keep open rather than close by assumption.