What a cameo is, how they were cut, and how to spot a moulded one

A cameo is a relief carved out of a layered material, so the figure stands in one colour against a ground of another. That is the whole definition, and everything interesting follows from it: the layers have to be there in the stone or shell before the carver starts, the carver is working blind through the top layer, and one wrong pass ruins months of work. Almost nothing sold as a cameo now is carved at all. Here is how real ones were made, why Naples ended up making most of them, and how to tell a carving from a casting in a few seconds.

Cameo and intaglio are opposites

A cameo is cut in relief: the carver removes the background and leaves the figure standing above it. An intaglio is cut the other way, incised into the surface, so the image is a hollow. Intaglios came first and were practical, because an incised stone in a ring is a seal that prints a raised impression in wax.

The cameo is the decorative inversion of that, and it arrives later, in the Hellenistic world from around the third century BC. The point of it was never only the image. It was that the image was made of the stone itself, in two colours, by somebody who had read the layers correctly before cutting.

The surviving imperial pieces are extraordinary objects by any standard: the Gemma Augustea in Vienna, the Gonzaga Cameo in St Petersburg, the Great Cameo of France. The Portland Vase, usually described with them, is cameo glass rather than stone, built up in two layers of glass and then cut back, which is harder again.

The materials, which decide everything

Banded agate is the classic. Sardonyx and onyx form in natural bands, so a block can be sawn to give a white layer over a brown or black one. The carver cuts down through the white to expose the dark as background, and the thickness of that white layer sets the maximum depth of the relief. Sometimes three or four bands are used, which is how you get a figure in one colour with drapery in another.

Shell replaced stone for most of the market in the nineteenth century, for the obvious reason that it is far softer and far quicker. The shells used are large tropical ones, helmet shells and queen conch, which have a pale outer layer over a darker one. Torre del Greco, just outside Naples, became the centre of the trade and still is, because the port had the shells and the town had the carvers.

Then the local specialities. Lava cameos were cut from the grey and brown stone of Vesuvius and sold to Grand Tour travellers as a souvenir of the volcano. Coral and jet were carved the same way, jet particularly in Whitby for the mourning trade. And from the 1770s Wedgwood made jasperware in pale relief on blue, which is a ceramic imitation of a stone cameo, moulded rather than carved, and was honest about being exactly that.

They were not cut, they were worn away

Agate is harder than steel. You cannot cut it with a blade, so gem engraving has never been cutting in the ordinary sense. The carver holds the stone against a small rotating wheel or point charged with a loose abrasive powder, historically emery or corundum and later diamond dust, and the abrasive does the work while the tool only carries it.

Before electricity the wheel was turned by a bow drawn back and forth, or by a treadle, which means one hand ran the drive and the stone was presented to the tool with the other. The carver worked by feel and by constantly wetting and wiping the surface to see where the white layer was thinning. A full sized stone cameo was months of work, which is why the imperial pieces were diplomatic gifts rather than jewellery.

Shell is soft enough to be worked with hand gravers, which is why the Torre del Greco workshops could produce a portrait in days rather than months, and why cameos went from treasury objects to something a middle class traveller could buy.

Rome, the Grand Tour, and the Victorian flood

Cameos revived whenever antiquity was fashionable. The Renaissance collected and copied Roman gems. The neoclassical period went further: Napoleon set cameos into his coronation regalia and established a school of gem engraving in Paris, and a cameo became the standard object to bring home from Italy.

The Victorian period is where the volume is. Portrait cameos of living sitters, mythological subjects copied from a stock of pattern books, and the habille cameo, which is a carved figure wearing tiny real gemstones set into the stone. Almost every antique cameo in circulation today is from this period and is shell rather than stone.

What all of it has in common is the oval. The format persists because a relief needs a frame to read against, and an oval with a plain or scrolled border is the most efficient one. The same logic is why a framed silhouette works on a wall: a bird half out of an oval frame is doing the identical trick in iron and at a hundred times the scale.

How to tell a carved cameo from a moulded one

Hold it to a light. A shell cameo is thin and translucent at the edges and the light comes through the pale relief. Resin and plastic are usually uniformly opaque or uniformly cloudy. Stone is opaque but cold, and it stays cold in your hand for longer than you expect, where plastic warms to skin temperature within seconds.

Turn it over, if the setting allows. The back of a shell cameo is concave, because it was part of a shell, and it often shows faint growth lines and tool marks. A moulded piece has a flat or domed back, frequently with a mould seam round the rim and sometimes small air bubbles in the surface.

Then use a loupe on the detail. Hand carving leaves undercuts: the carver has gone in behind a curl of hair or under a nose, and you can see shadow where the material is cut back. A mould cannot produce an undercut, so moulded relief is always slightly soft and open, and every example in a batch is identical. If you can compare two of the same design and the detail matches exactly, neither is carved.

What a cameo style piece is now, including ours

The honest position is that almost all modern jewellery in the cameo format is cast or moulded, not carved, and that includes the pieces we sell. The Cat in the Frame is a cast piece working in a four hundred year old format. It is not a carved shell cameo, and if a listing anywhere does not say carved shell or carved stone, assume it is not one either.

That is worth knowing rather than worth minding. A moulded relief in an oval is the descendant of jasperware rather than of gem engraving, and jasperware has been a respectable thing to own since 1775. What you are buying is the format, the silhouette and the frame.

Where it does matter is price and repair. A carved shell or stone cameo is a one off object and a damaged one can sometimes be re cut. A moulded one is a multiple, and a chip in it is permanent. It also matters for wear: relief catches on clothing, so any piece with proud detail, including something like a lace heart with a beak below it or a raised flower on a band such as the rose choker, lasts longer if it is the piece you put on last and take off first.

Questions people actually ask

What is the difference between a cameo and an intaglio?

A cameo is carved in relief, so the figure stands out from the background. An intaglio is incised into the surface, so the image is a hollow. Intaglios were made to be used as seals, which print a raised impression when pressed into wax.

What are cameos made of?

Traditionally banded agate, sardonyx or onyx, where the carver cuts through a pale layer to reveal a dark one. From the nineteenth century most were carved from shell, which is far softer and quicker. Lava, coral, jet, glass and moulded ceramic were all used too.

How can you tell if a cameo is real?

Hold it to a light: carved shell is translucent at the edges, resin is usually uniformly opaque. Check the back for a concave shell surface and growth lines rather than a mould seam. Under a loupe, hand carving shows undercuts that a mould physically cannot produce.

How were cameos carved before power tools?

By abrasion rather than cutting, because agate is harder than steel. The carver held the stone against a small wheel or point charged with emery or corundum powder, driven by a bow or a treadle, and a full stone cameo took months.