How a Plain Wedding Band Is Actually Made – Mapple Gems

Wedding Bands

How a Plain Band Is Actually Made

Two different methods produce two different rings — and the difference shows up twenty years later, not on the product page.

Written by the Mapple Gems workshop, Surat · Updated 27 September 2026

Short answer

Plain bands are made two ways. Cast — molten metal poured into a mould — which is fast, cheap and can leave microscopic porosity inside the metal. Or formed from mill stock: solid rolled metal cut, bent, soldered and finished, which is denser and more consistent and is what a bench means by a properly made band. Both are legitimate; the second lasts better under decades of daily wear. Ask which one you are buying, along with the thickness and finished gram weight.

A plain band looks like the simplest object in jewellery, which is exactly why the differences between two of them are invisible. Knowing how they are made is the fastest way to see what you are actually comparing.

Casting a plain band is quick and cheap, and it can leave tiny voids inside the metal that nobody can see until years later. In casting, molten gold is poured or spun into a mould and left to solidify. As it cools it contracts, and gas dissolved in the melt can come out of solution — which occasionally leaves microscopic porosity distributed through the metal. On a decorative piece that is of no consequence. On a plain band worn daily for twenty years it matters, because the ring slowly wears down to the metal that was originally in the middle, and porosity can surface as tiny pits, or show up as a weak point when the band is eventually resized or reshanked. A band formed from mill stock has no such history: the metal was rolled and worked before it ever became a ring, so it is denser, more uniform and work-hardened. It costs more in labour and it is what a bench will make if you ask for a band built to last. Neither method is dishonest — but only one of them is usually mentioned, which is neither.

The two routes

	Cast	Formed from stock
Process	Molten metal into a mould	Rolled stock cut, bent, soldered
Density	Can contain porosity	Dense and uniform
Labour	Low	Higher
Suits	Shaped and decorative designs	Plain bands worn daily
Joint	None	One solder seam, invisible when good

The seam is worth a word. A formed band has one soldered joint, and in competent work it is undetectable — the same joint a jeweller makes every time a ring is resized. It is not a weakness; a well-made solder joint in gold is as strong as the surrounding metal.

What happens at the bench

Stock is selected to the finished width and thickness — this is where your 2 mm either exists or does not.
A length is cut calculated from the ring size, allowing for the metal’s behaviour when bent.
It is annealed and formed into a circle around a mandrel.
The ends are butted and soldered, then the ring is trued back to round.
The interior profile is cut — flat, or domed for comfort-fit.
The exterior is shaped — flat, court, bevelled or knife-edge.
Finishing: edges softened, then polished, brushed or hammered.

Step five is the one buyers never hear about and feel every day. Comfort-fit is metal removed from the inside, so a comfort-fit band at a stated thickness has less metal than a flat-interior one at the same figure — which is why the gram weight is the honest number rather than the millimetres alone.

Why this changes what you should ask

Once you know a band is width, thickness, two profiles and a finish, the questions become obvious — and they are the ones that separate two rings at the same price.

“Is it cast or formed from stock?” A workshop answers immediately. A reseller usually cannot.
“What is the thickness in millimetres?” Width is cosmetic; thickness is the structural story and almost no listing states it.
“What is the finished gram weight?” The one figure that captures everything, and it is verifiable against the public gold price.
“Is the interior comfort-fit?” It affects both feel and the sizing, since comfort-fit runs about a half size large.
“Can I see it from the side?” The profile is what your finger notices and what no top-down photograph shows.

Where hand work still shows

Three details a machine-finished band rarely has, and each is visible if you look for it.

Softened interior edges. The two inside rims are where a band digs in. A bench softens them by hand; production finishing often leaves them sharp, and it is the commonest reason a correctly sized ring feels wrong.

A finished interior. The inside should be as smooth and even as the outside. It is the surface nobody photographs and the one against your skin for decades.

Even wall thickness all the way round. Hold the band up and look through it — a poorly formed ring is visibly thinner at one point, usually opposite the solder seam.

One consequence for later

Because forming work-hardens metal, a band made this way holds its round shape slightly better — and because it starts denser, it has more material to give before a reshank is needed.

Worth knowing in the other direction too: heavily work-hardened old metal can crack rather than bend when resized decades later, so any jeweller working on an old band should be told it is old. That is a maintenance note rather than an argument, and it applies to inherited pieces generally.

Keep reading

Frequently asked questions

Is a cast wedding band worse than a formed one?

Not worse, but different. Casting can leave microscopic porosity inside the metal, which matters little on decorative pieces and more on a plain band worn daily for decades, since the ring eventually wears down to that metal. A band formed from rolled stock is denser, more uniform and work-hardened.

Is the solder seam on a formed band a weak point?

No. A well-made solder joint in gold is as strong as the surrounding metal and is undetectable in competent work — it is the same joint a jeweller makes every time a ring is resized. A formed band has exactly one.

Why does gram weight matter more than millimetres?

Because comfort-fit removes metal from the inside, so two bands at the same stated thickness can contain noticeably different amounts of gold. The finished gram weight captures width, thickness and interior profile in one figure — and it is verifiable against the public gold price.

Why does my correctly sized band feel uncomfortable?

Usually sharp interior edges. The two inside rims are where a band digs in; a bench softens them by hand while production finishing often leaves them square. It is a quick fix at any bench, and a comfort-fit interior removes the issue entirely.

Ask whether it is cast or formed — and for the gram weight.

Two questions that separate two plain bands at the same price better than anything on the listing does.

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