The first thing you say is usually "smaller than I thought"

The pendant in the photograph hangs at a model's collarbone and fills half the frame. In your hand it is the size of a fingernail. The same bracelet hangs loose on a thin wrist and sits perfectly on a thicker one. A photograph carries character; it does not carry scale.

So the part of a product page that actually matters is the few lines of numbers: which ones to read, how to measure for yourself, where the tolerance comes from, and what is included. Read those and you can judge at least one thing — roughly what this will look like on you.

This is not a demand that every shop photograph its stock like a museum specimen. Making a photograph look good is one job. Getting the numbers right is a different job. Both need doing.

Pendants: three numbers, and none of them optional

Height, width, thickness. Height (including the bail) sets the visual weight; width at the widest point sets the horizontal proportion; thickness decides whether it lies against clothing or stands off it. Plenty of people check only height and discover on arrival that it is "too thin, like a piece of sheet metal" or "too thick, it keeps tipping up".

One trap to watch: whether the bail is included. Some listings give the height of the body, others the total including the bail, and the difference can be five to eight millimetres. Those five millimetres are often the answer to "will this be too big on me".

Under two millimetres thick reads as light and flat, good for layering and for summer. Three millimetres and up has visible presence and holds its own against plain clothing. Past five millimetres it is a substantial piece, and you should think about whether the chain can carry it.

Chains: length matters more than the pendant

Around 40 cm sits above the collarbone and looks crisp. 45 cm falls at the middle of the collarbone and is the most everyday length. 50 cm reaches the upper chest, shifting the weight down, and suits a wider neckline. From 60 cm it is a long chain — double it, or wear it over knitwear.

Beyond length, look at width. A chain around 1 mm carries a small pendant; 2 mm and up bears more weight, so a large pendant does not look top-heavy. Do not forget the clasp: a spring ring is convenient, a lobster clasp is secure, an S-hook is period-correct but slides open on its own.

Where a page says only "adjustable", ask for the range. "45+5 cm" means a 45 cm chain with a 5 cm extender. Those five centimetres decide where the pendant actually lands.

Rings: the size is only the start

Ring size refers to the inner diameter. Chinese listings usually give millimetres; Hong Kong and US sizes exist too, and converting between them is easy to get wrong. The safest thing is to work in inner diameter. To measure: wrap a thin non-stretch thread around the base of the finger, measure the circumference, divide by pi for the diameter — or measure the inside of a ring you already own.

A wide band feels tighter than a thin ring of the same size, because more surface is in contact and there is more friction. Above 8 mm, go up half a size to a full size; better slightly loose than stuck at the base of the finger. Fingers swell a little in summer and shrink in winter, so measure in the afternoon at room temperature.

Open rings are more forgiving, but check two things. Whether the edges of the opening are rounded — if not, they catch clothing. And do not keep bending it: metal fatigues, and eventually a fine crack appears at the opening.

Bracelets: bead size, count and slack

Six millimetre beads read delicate, eight is the most common, ten and above has strong presence. For the same wrist circumference, larger beads mean fewer of them. Look at the stated wrist range rather than the bead count; it is more direct.

Allow one to one and a half centimetres of slack. One centimetre if you like it close, one and a half if you like it loose. Too tight leaves a mark, too loose knocks against everything. On elastic bracelets, look at the cord quality; elastic stretches with use, which is ordinary wear.

For bracelets, also check the extender and the clasp. An extender is usually three to five centimetres, which covers most of the difference in wrist size. A lobster clasp is more secure than a spring ring; a magnetic clasp is convenient but pulls apart.

Earrings: weight first

The most overlooked figure with earrings is weight. Above five grams per ear, two or three hours of wear produces a noticeable drag, and the piercing itself can stretch. Under three grams is safer for everyday pairs; statement pieces for formal occasions can be heavier, but are not for long wear.

The pin material matters. S925 silver pins and titanium pins suit sensitive skin. Alloy pins are cheap, and some people react to them. On clip-ons, check the tension: too tight hurts, too loose falls off, and silicone pads help.

Then length. Drops longer than five centimetres catch on a shoulder or a collar when you turn your head, and get in the way when driving, wearing headphones or wearing a high collar. Think about what you actually do all day before you look at the model photograph.

What the fittings are called

The three-hole bead is the junction piece in a beaded strand, usually with three holes, joining the main strand to a pendant. It marks a turn in the structure and a visual focal point. Check that the hole size suits the main beads: too small and the cord will not pass, too large and the beads rattle.

A spacer bead sits between main beads, separating materials, adding a layer, and reducing direct rubbing between beads. Its diameter is usually smaller than the main beads; too large and it steals attention.

The extender chain is the adjustable section at the end of a bracelet or necklace, made of small rings or a fine chain. It sets the range of adjustment and affects how the piece hangs. Too short and there is nothing to adjust; too long and it catches on clothing.

The dangling charm — also called a drop — hangs below the main piece, for decoration and balance. Its weight shifts the centre of gravity; too heavy and the main piece tips forward. Besides the shape, check that the connecting ring is sound.

The gau box is a small Tibetan portable box, usually hinged, with a space inside for a small object. Two things to check: whether it closes firmly, and whether the interior is large enough. Too loose and it springs open; too small and nothing fits. For a gau box worn as jewellery, the priorities are workmanship and proportion rather than interior space.

Between screen and object

Besides size, colour is easy to get wrong. Silver looks whiter under cool light and yellower under warm light; the same piece can be photographed in two different keys. The degree of antiquing on copper is harder still — a shade deeper or lighter changes its character completely. Lustre behaves the same way: high-polish pieces catch the studio lights and flare, while in the hand they are less dazzling; matte and antiqued finishes go the other way, looking flat on screen and usually showing more depth in person.

When you look at product images, find one with a hand or a coin in it for reference; it gives a better sense than a plain white background. With no reference, go by the numbers on the page rather than estimating from the image proportions. After a while you get a feel for it.

Why some pieces have no exact figures

Handmade work is genuinely hard to specify. Within one batch, height and weight vary from piece to piece. Giving an average and stating clearly that it is an average is more honest than forcing a figure to two decimal places.

Natural materials more so. Within one batch of southern red agate or turquoise, colour and grain differ and bead sizes vary. In those cases read the range; do not chase a single fixed number.

Conversely, a piece described as handmade but specified to a fraction of a millimetre deserves a question. Either it is not handmade, or the number was copied from somewhere.

Why the stated and the actual differ

Hand measurement usually carries a tolerance of plus or minus 0.5 to 1 mm. That is normal practice, not short measure. Cast pieces shrink slightly and carry a little flash; chased work cannot be the same depth everywhere. Natural stone and wooden beads vary more, and colour variation within a batch is normal.

What should make you wary is natural material that is perfectly uniform across a batch. That usually means dyeing or treatment. Fine differences in grain and depth of colour are the evidence that it is natural.

For anything where size is critical — a closed ring, a choker — state the requirement before ordering and ask for the piece to be measured once before dispatch. Easier than posting it back and forth afterwards.

A checklist before ordering

Are the dimensions complete: height, width, thickness, inner diameter, bead diameter, chain length — and does the height include the bail, does the length include the extender. Is the material clear: what the body is, what the fittings are, whether there is plating and what it is. What is included: chain, ear backs, spacer beads, extender — ask. Is the weight stated: anything over fifteen grams in an earring or pendant needs thinking about. Is the tolerance explained: hand measurement, natural variation.

Five things settled, and "it was not right when it arrived" becomes much less likely. A shop that specifies in detail is usually worth trusting. People who are willing to put the numbers on the table tend not to be vague elsewhere.

Numbers describe a relationship with your body

Specifications are not cold. They say how heavy a thing is, how wide, and where it will sit on you. Know that, and the first time you see it you can tell whether it is yours.

The reason for listing everything is to let you see the piece on yourself before you order it.

Different categories, different priorities

Votive plaques and gau boxes: look at the outer dimensions and the interior space. The frame sets the proportion on the body; the interior decides whether it can hold anything. Plenty of people buy on appearance and find the box will not open, or that nothing fits inside.

Display pieces and hanging ornaments: look at base area and weight. A display piece on a desk or shelf topples if the base is unstable, and if it is heavy, think about what the shelf will take. For a hanging ornament, confirm the hook's load and whether it suits the wall.

Rings and bangles: look at inner diameter and the width of the opening. A bangle is rigid, so the inner diameter has to clear the widest part of the hand — usually two to three centimetres more than the wrist circumference. On an open bangle, check how much the opening gives and how the edges are finished; too small and it will not go on, too large and it slides off.

Earrings: look at the weight per ear and the fitting. For the same pair, a clip-on is usually heavier than a pin because of the mechanism. If you wear headphones or spend the day on the phone, a stud is easier than a long drop.

Measuring at home

Wrist: a soft tape around the wrist just above the bone, close but not tight, and note the circumference. Without a tape, wrap a thin thread and measure the length. The position is the narrowest part of the wrist, not the back of the hand.

Finger: a thin thread around the base of the finger, measure the circumference, divide by 3.14 for the diameter. Fingers swell slightly in the evening, so measure in the afternoon. Between two sizes, take the larger.

Neck and chain length: use a thread to trace the line a necklace would take, from the back of the neck to the chest, and find where you want the pendant to stop; cut and measure. For a first long chain, this is far more reliable than guesswork.

Pendant proportion: cut a piece of paper to the stated dimensions and hold it against yourself in the mirror. Crude, but effective, and much more reliable than imagining from a screen.

Packaging counts as size

Dimensions on a product page describe the piece, not the packaging. If it is a gift, the size and thickness of the box matter too. Some items — display pieces, sets — come with their own outer box, and take up considerably more room than the stated dimensions of the piece.

For cross-border shipping a rigid gift box protects better, but adds weight and cost. If packaging matters to you, say so before ordering; it is more useful than saying it afterwards.

Same design, different batch

Slight differences between batches of handmade jewellery are normal. Casting moulds wear, polishing pressure varies, settings sit a little off — all at the level of millimetres. Natural materials show it more: two batches of the same southern red agate or turquoise will not match in colour or grain.

If you have bought one you like and want another as a gift, say in advance that you would like it close to the last one, and ask them to pick from a similar batch. Identical is not possible; close is worth asking for.

Putting specifications to use

Specifications are useful before you order, not after the parcel arrives. Read "3.2 cm high, 1.8 cm wide, 0.4 cm thick, 7 g" and you should be able to picture it sitting below the collarbone, and which few outfits it will work with.

If it still does not form a picture, compare it with something you already own of a similar size. People are poor at imagining centimetres and very good at judging "about the same size as that".