18K Gold Rings

It records surface contact sooner, because an alloy containing more gold and less of the other metals is the softer of the two.

What that looks like is a gradual satin quality rather than deep individual scratches, and it develops over months rather than days.

How much it matters depends far more on how the ring is worn than on the alloy: a band removed for manual work sees a fraction of the contact of one that never comes off.

The mirror finish will have gone, replaced by a soft even sheen, and the edges of the band will have rounded very slightly.

Any engraving inside will still be legible, since the inner surface meets only the finger, though its edges will have softened.

A jeweller can restore the original finish, and many owners choose not to, because the worn surface is what a long-worn ring looks like.

It is the default alloy for fine jewelry across much of Europe, so bridal stock, engagement mounts and matching bands are all built in it as a matter of course.

That means a set bought within one market arrives already matched in alloy, colour and finish, which is harder to achieve when the two rings are bought in different places.

For a buyer comparing markets, the useful step is deciding the metal for both rings at the outset rather than one ring at a time.

A softer alloy files and blends readily, so a sizing join on a plain band can be worked down until it is genuinely hard to locate.

What actually limits sizing is the design: stones set all the way around a band, or a pattern running through the shank, both restrict how much can be done.

Ask before buying if a ring may need sizing later, because the answer depends on that particular design rather than on the metal.

It is done constantly and there is no reason not to, though two rings in permanent contact rub against each other every time the hand moves.

Where two alloys differ, the softer one takes more of that contact over the years, which shows on the facing surfaces rather than on the outside of either ring.

If the two are meant to look like a set, comparing the yellows in daylight before buying the second is the step that settles it.

Width is a comfort decision first. A narrow band disappears on the hand; a wide one occupies the finger and feels closer at the same nominal size.

For a ring in constant contact with surfaces, a slightly more substantial section gives the jeweller material to work with when it is eventually re-finished.

Hold a ruler against the millimetre figure on the listing before deciding, since widths read smaller on paper than most people expect.

Polishing removes metal from any alloy, and a softer one cuts a little faster under the same wheel, so a light touch matters more.

The practical rule is to re-polish deliberately rather than routinely. A band re-finished every year across decades grows measurably thinner.

A jeweller who works lightly, and who is told that the shape and any engraving matter, will take off far less than one working quickly.

It is a common choice, and settings cut and burnish predictably in a softer metal, which is an advantage on fine work.

The consideration is height rather than alloy: a stone standing well clear of the band is knocked more often whatever it is set in.

Have the setting checked periodically, and where possible take the ring off for anything that involves gripping tools or equipment.

Any thin, narrow band in any alloy can be pushed out of round if it is squeezed or caught, and a softer metal yields sooner under that force.

It is usually reversible: a jeweller can bring a band back to round on a mandrel, provided the metal has not been repeatedly worked at one point.

Section thickness and width predict this far better than the alloy does, which is why a substantial band deforms less readily than a fine one.

The alloy itself does not change colour. What changes is the surface, and a satin surface scatters light where a polished one reflects it, so the ring reads slightly deeper and less brilliant.

In white gold the visible change is the rhodium plating thinning, which shows first on the parts of the band that meet surfaces most.

Both are restored by re-finishing, and in the case of white gold by re-plating, which a jeweller does as routine work.