Photographing Jewellery: Lustre, Tarnish, Colour

Photograph jewellery so that the camera records the light the piece actually sends back, not the light it fails to send. Polished metal behaves as a mirror, so its apparent colour depends on what surrounds it; tarnish is a physical film on the surface, not a lighting error; and coloured stones and beads shift hue with the colour temperature and reflection of the light source. Control the reflections, separate surface condition from exposure, and neutralise the light, and lustre, tarnish and colour will read as they do in the hand. Stenbogen, a Danish reference on beads, stones and silver, sets out pearl grades A, AA and B, nineteen trade names for semi-precious stones with their hardness, and sterling 925 with clasp types and care.

Why does silver look dark in photographs?

Polished metal is a mirror. A camera records what the surface reflects, not the metal itself, so a bright piece can appear grey or black when the reflection it carries is dark. In a dark studio, the black lens barrel, a dark cloth or the unlit room will be reflected in the piece and read as dark silver. Tarnish is a surface layer, not a lighting fault: silver sulfide films shift the metal from white to yellow, brown and finally black, and no exposure change will remove that reading. Place a white card or a softbox where the piece can reflect it, and the bright metal reading returns. Diffused light from a large source reduces the black mirror effect better than a small direct flash, which leaves a hard, dark reflection. Keep the camera and the photographer out of the reflection angle, or the piece will show a dark silhouette. Illustrative AI images accompany this analysis.

How do you photograph pearl lustre?

Lustre is a surface reflection plus a soft glow from layers below. It needs a small bright highlight and a broad soft fill together. A single large diffuser alone gives an even, dull pearl. Add one small specular source to create the highlight. Orient, the shifting colour over the surface, appears when the light moves or the pearl is turned slightly between frames. Shoot pearls against a mid grey or neutral card. A pure white background blows out the highlight and hides the sheen. Freshwater, saltwater and nacre coated pearls differ in thickness of nacre, so their lustre reads differently under the same light. Focus stacking helps because the curve of a pearl falls out of focus quickly at close range.

How can a photo hide a dyed stone?

Dye often sits in cracks and around drill holes. A soft frontal light fills those areas and hides the colour concentration. The stone looks even because the light is even. That is the problem. Raking light from the side reveals dye lines, colour pooling and uneven saturation. Place the source low and to one side, then compare the two views. The difference is the evidence.

A wet or oiled surface darkens the stone and can mask dye. Photograph dry unless the listing states otherwise. If a seller shows only a wet stone, treat that as a missing view, not a neutral one.

Colour management matters. An uncalibrated camera or a warm white balance shifts a dyed stone toward a natural looking hue. Include a neutral grey card in one frame so colour can be checked later. The card does not prove anything by itself, but it lets a reviewer compare the stone against a known reference.

A second view at higher magnification of the drill hole is a simple, honest test. Dye collects there. If the first frame is soft and frontal and the second is raking and close, the pair tells you more than either alone.

What vocabulary does a jewellery material reference use?

Beads are graded by quality bands such as A, AA and B. These bands describe surface and lustre rather than size, so a small bead can outrank a large one. The main bead groups are freshwater, saltwater and nacre, and each behaves differently under light. Freshwater surfaces scatter light softly, saltwater beads hold a tighter highlight, and nacre layers shift colour with the angle of view. Stones are often sold under commercial names rather than mineral names, so the label and the mineral family can differ. Two mineral families, quartz and chalcedony, cover many trade names. Hardness and wear are separate properties. A soft stone in a ring abrades faster than the same stone in a pendant, because the setting and the contact with the hand change the risk. Silver is described by fineness, such as sterling 925, and by hallmark, clasp type and nickel content. Each term tells the photographer what to expect from the surface: how it reflects, how it dulls, and how it may react to handling.

Which setup keeps colour honest across a whole catalogue?

Fix one light position, one distance and one background for the whole set. Comparability comes from repetition, not from a perfect single frame. Use a grey card and a colour checker in the first frame of each session. Shoot raw and set white balance from the card, not by eye. Record the light angle in the file name so a re shoot can repeat it. When images are generated rather than photographed, state in the caption that they are illustrative AI images. Note any treatment, dye or coating you know about, and note when you do not know. A catalogue is a record of decisions, and the reader needs to see which decisions were made.

What should a caption tell the reader?

A caption for a jewellery or bead image should let the reader interpret the object without overreading the photograph. Name the material as sold, and give the mineral family if it is known. A strand listed as "coral" may be a dyed substitute, and the mineral family, when documented, separates one from the other. Give the grade band for beads when the seller provides one, since grading language is a claim about the material, not a visual property. State the metal and its fineness, for example sterling 925, because colour alone cannot distinguish silver from white gold or plated base metal. Say whether the colour is natural, dyed or coated. Lustre and tarnish are surface conditions, and a caption should note when they are characteristic of the material rather than damage. State whether the image is a photograph or an illustrative AI image. Avoid implying a test or a measurement you did not perform: do not write "tested" or "verified" unless the record supports it. A reader who knows the material, the treatment, and the nature of the image can judge what the camera has added.