What happens if my diamond is damaged during resetting?

A reputable jeweller carries insurance covering customers' goods while in their care, and should tell you promptly if damage occurs rather than hoping you won't notice. Ask what cover is in place before work begins, and get any liability commitment in writing on your job sheet or terms of business.

Should I get my diamond valued or graded before handing it over for resetting?

Yes, this is good practice for any stone of meaningful value. A dated grading or valuation report, ideally with photographs, establishes the diamond's condition before work starts, which protects both you and the jeweller if a dispute ever arises about pre-existing damage.

Can a chipped diamond still be reset?

Often yes, though a chip may need to be addressed first. Small chips can sometimes be polished out with minimal weight loss, or worked around with a protective setting style such as a bezel that covers the damaged area. A jeweller will advise based on where the chip is and how it affects the stone's outline.

Is it riskier to resize a ring than to reset the stone into a new mount?

Resizing an existing setting can actually carry similar or greater risk than resetting, particularly with claw settings, because the stone stays under tension in the mount while heat is applied nearby during soldering. Many jewellers prefer to remove the stone entirely before resizing or altering the band for exactly this reason.

What are the risks of resetting an old diamond into a new setting?

Resetting an old diamond is routine work for an experienced jeweller, but it is not risk-free, and any jeweller who tells you there is no chance of anything going wrong is not being straight with you. The risks are specific, well understood in the trade, and almost always manageable — but it is worth knowing what they actually are before you hand over a stone that matters to you.

Chipping during unsetting and setting

The two moments of highest risk are removing the stone from its old mount and securing it in the new one. Both involve applying physical pressure to the diamond, usually by bending metal claws away from the stone to release it, or bending new claws over it to hold it. Diamonds are the hardest natural material, which makes them highly resistant to scratching, but hardness is not the same as toughness — diamond is actually relatively brittle along certain planes, and a sharp knock or concentrated pressure at the wrong point, particularly at the girdle or culet, can chip it.

The girdle, the narrow band running around the stone's widest point, is the area most exposed during setting, because it is exactly where claws or a bezel grip the stone. The culet, the small facet or point at the base, is more of a risk during unsetting and handling, since it is thin and can catch on tools or the mount itself.

Why antique stones are often more vulnerable

Old mine cut and old European cut diamonds, the cuts most commonly found in Victorian, Edwardian and Art Deco jewellery, tend to have thinner girdles and larger, more pronounced culets than modern round brilliants. This was partly a feature of the cutting technology and style of the period, not a flaw, but it does mean these stones are frequently more delicate at exactly the points where setting work applies stress. A large, sharp culet in particular is more prone to chipping than the tiny, often faceted culet on a modern stone.

This does not mean antique cuts cannot be safely reset — they are reset successfully all the time — but it does mean the margin for error is smaller, and it is one of the main reasons experience with older stones specifically matters when choosing who does the work.

Existing fractures and inclusions

Many diamonds, old and new, contain natural inclusions: tiny crystals, feathers (small internal fractures) or clouds formed as the stone grew. Most inclusions are cosmetically invisible and pose no practical risk. The concern is inclusions that reach, or come close to, the surface of the stone, because these can act as a starting point for a fracture to widen under mechanical stress. A feather that has sat stable for a hundred years inside a mount can, in rare cases, extend if the stone is knocked or pressured at the wrong angle during setting work.

This is precisely why a proper inspection under magnification before work begins matters: a jeweller who spots a surface-reaching feather can adjust their handling, choose a setting style that avoids putting pressure near it, or flag the risk to you directly before proceeding, rather than discovering it mid-repair.

Who bears the risk — the jeweller's terms of business

Reputable UK jewellers set out their terms before taking in customers' own stones for work, and it is worth reading these rather than assuming. Points to look for or ask about:

Whether the jeweller inspects and photographs or notes the stone's condition on intake, so there is a clear record of its state before work began.
Whether their terms accept liability for damage caused during the work itself, as distinct from pre-existing damage or issues arising from the stone's own condition (such as a previously undetected internal fracture that extends despite correct handling).
What happens in the event of damage or loss — replacement, repair, or a value-based settlement — and how that value is determined.

A jeweller who is vague about any of this, or unwilling to put basic terms in writing, is worth being cautious about, regardless of how the finished work might turn out.

Insurance during the work

Two layers of insurance are relevant. First, the jeweller's own business insurance should include cover for customers' goods in their care, in transit, and in the workshop — this is standard for any UK jeweller who takes in third-party stones and repairs, and you can reasonably ask whether it is in place. Second, your own home contents or specialist jewellery insurance may or may not cover an item while it is out of your possession for repair; policies vary, and some exclude items in the care of a third party or require the item to be listed with the repairer's details. It is worth checking your own policy's wording before sending off anything of high sentimental or financial value, rather than assuming you are covered.

How good jewellers mitigate the risk

Experienced jewellers manage these risks through practice rather than luck:

Inspecting the stone under magnification before quoting or starting any work, to identify existing chips, fractures or thin girdles in advance.
Choosing setting styles that protect known weak points — a bezel or a fully-enclosing claw arrangement over a girdle that is already thin or nicked, for example.
Using appropriate tools and techniques for the specific stone, rather than treating every diamond the same way regardless of age or cut.
Working slowly and stopping to reassess if something about the stone's behaviour under pressure seems unexpected, rather than pushing through to finish on schedule.
Keeping heat sources (used in soldering) well clear of the stone, or removing the stone entirely before any soldering takes place near the mount.

None of this eliminates risk entirely, but it is the difference between a small, well-understood chance of an incident and a genuine gamble.

When a jeweller will decline the work

A conscientious jeweller will sometimes tell you a stone is not ready to be reset as it stands. This usually happens when a chip already affects the stone's outline in a way that setting would worsen, when a fracture is judged too close to the surface to risk further handling without stabilising or addressing it first, or when the existing mount is so fused or deteriorated that safe removal cannot be guaranteed without additional risk. In these cases, the honest response is to explain the specific concern, discuss options such as re-polishing a small chip or choosing a more protective setting style, and let you decide how to proceed with full information — not to quietly take the job on and hope for the best.

The bottom line

The risks of resetting an old diamond are real but well understood: chipping at the girdle or culet during handling, and the small chance that an existing internal flaw worsens under pressure. Antique cuts carry somewhat higher risk than modern ones because of their proportions, not because they are inherently poor quality. The practical protection is a jeweller who inspects the stone properly before starting, is honest about what they find, has clear terms of business and adequate insurance, and is willing to say no or propose an alternative when a stone genuinely isn't ready for the work.