Education
What a Bench Check Actually Involves
Twenty minutes every two years, and it prevents nearly every expensive thing that happens to a ring.
Written by the Mapple Gems workshop, Surat Β· Updated 5 October 2026
Short answer
A jeweller inspects the piece under magnification and checks six things: prong tips, stone security, shank thickness at the base, the roundness of the band, the clasp or closure, and the state of any plating. It is diagnostic rather than remedial β the point is to find what is becoming a problem. Every two years for a daily-worn ring, yearly for anything with a clasp. And say βdo not polishβ, which is otherwise done by default and removes metal each time.
The two-year bench check is the cheapest item in jewellery ownership and the one that prevents the expensive ones. It is also the least understood, because nobody explains what is actually being looked at.
Almost nothing in a ring fails suddenly β it thins, and thinning is visible for YEARS before it becomes a loss. That gap is the entire value of a bench check. Prongs do not snap; they wear from the outside in, and the small folded lip at the tip that actually holds the stone down flattens gradually. A shank does not break; it gets thinner at the base until it flexes enough to work settings loose. Plating does not fail; it wears through at the contact points. Every one of those is legible under a loupe long before anything is at risk β a flattened prong tip typically shows three to five years before a stone is lost, and a thinning shank shows a decade before it needs replacing. The difference between the two outcomes is entirely whether anyone looked. A re-tip caught early is minor bench work; a stone lost from a worn prong is an insurance claim, an excess, and a replacement that may not match the parcel the others came from. And the check itself finds problems in a batch: prongs that shared the same years of wear fail on the same schedule, which is why one loose stone is never really one loose stone.
The six checks
| Checked | Warning sign | If found |
|---|---|---|
| Prong tips | Flattened or squared lip | Re-tip β minor work |
| Stone movement | Any click under a fingernail | Tighten now, not later |
| Shank at the base | Under ~1.5 mm | Reshank due |
| Roundness | Visibly oval through the circle | The band has been flexing |
| Clasp or closure | Click no longer positive | Re-tension or replace |
| Plating | Warm tone showing through | Replate (white gold only) |
How often, by piece
- Daily-worn ring: every two years. Sooner if the hands work hard, or after any knock hard enough to notice.
- Anything with a clasp: yearly. A clasp is the only moving mechanism in most jewellery and it wears on its own schedule.
- PavΓ© or a tennis piece: yearly. Not because it is fragile but because forty or two hundred settings means forty or two hundred chances.
- Occasion pieces: before the occasion, and a week ahead rather than the night before β an inspection sometimes finds a loose stone and you want time.
- Immediately, not on schedule, if a stone has been lost from anywhere on the piece. Its neighbours shared the same years of wear.
What to say when you hand it over
- βDo not polish.β The single most important sentence. Polishing is done by default at the end of most jobs, it removes metal every time, and on an older piece it softens hallmarks and hand-cut detail permanently.
- What the stones are, and any treatment. Some treated stones are damaged by ordinary bench heat, and moissanite, diamond and sapphire behave differently.
- That the piece is old, if it is β work-hardened antique metal can crack rather than bend.
- Where any engraving is, so nothing is worked over it.
- Ask for the shank thickness in millimetres while it is on the bench. It dates the ringβs remaining life better than anything else and takes two minutes.
Who should do it
For a check, any competent local bench β it needs a loupe, a gauge and experience, not the original maker. Sending a piece across a border for an inspection is time and shipping risk for no gain.
Where the maker matters is information rather than skill: they hold the CAD file, the melee parcel specification, the exact alloy and the original shank dimensions. That is worth having for a stone replacement or a rebuild, not for a routine look.
One thing to check first: third-party work usually voids a makerβs warranty. If the piece is still within warranty, ask what is excluded before anyone else touches it.
The check you can do yourself
Not a substitute, but it will catch most problems between visits, and it takes thirty seconds while the piece is wet from cleaning.
Press each stone with a fingernail β any movement or faint click means bench work now. Look at the stone row straight down in daylight: every table should sit level. Shake it gently near your ear; a loose stone can rattle faintly. Hold the band up and look through the circle for ovalness. And on a chain or bracelet, check the clasp still clicks positively and look at the link beside it.
A 10Γ loupe costs very little and turns that into a real inspection: prong tips should be rounded, defined lips, not flattened or squared.
Keep reading
Frequently asked questions
How often should a ring be checked by a jeweller?
Every two years for a daily-worn ring, and yearly for anything with a clasp or many small settings. Check immediately β not on schedule β if a stone has been lost, since the neighbouring prongs shared the same years of wear.
What does a jeweller look at during a check?
Six things under magnification: prong tips, whether any stone moves, shank thickness at the base, whether the band is still round, the clasp or closure, and the state of any plating. It is diagnostic β the point is finding what is becoming a problem.
Why should I tell them not to polish?
Because it is done by default at the end of most bench work and it removes metal every time. On an older piece it softens hallmarks, makerβs marks and hand-cut detail permanently β and habitual repolishing thins a ring faster than wearing it does.
Does it have to go back to the original maker?
Not for a routine check β any competent local bench can do it. The maker matters for information rather than skill: the CAD file, the melee parcel specification, the exact alloy. But check first whether third-party work voids a warranty still in force.
Ask for the shank thickness while it is on the bench.
Two minutes, and it tells you more about the ringβs remaining life than anything else you could measure.
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