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Stone defect or natural feature?

In short. With natural stone, the line between a defect and a characteristic is not drawn by the eye of whoever is looking, nor by the supplier’s word: it is drawn by a document agreed before cutting. Here is what the European standard treats as typical of the stone, what to check at delivery, how long you have to object, and who pays.

Why do two people look at the same top and see two different things?

Because they are looking at two different things. The buyer compares the top with the picture in their head, formed in a showroom on a slab that was wet and lit. The maker compares it with the slab it came out of. While they remain two different yardsticks, the argument does not end.

The trade solved this with an object: the reference sample. The European standard for natural stone slabs, EN 1469, puts it at the centre and states something worth reading twice: all the characteristics shown by the reference sample shall be considered typical of the stone and not as flaws. Not «may be»: shall be. Material is rejected only if those characteristics become so concentrated that the typical character of the stone is lost.

For the sake of accuracy: EN 1469 covers cladding slabs, not table tops. But the method it sets out is the method of the trade, and it holds for any piece of natural stone.

What is the reference sample?

It is a piece of stone, or several pieces, representing the appearance the supply will have. The standard asks three things: that it be no smaller than 0.01 square metres, ten by ten centimetres; that it show the typical characteristics of the stone — holes, veins, spots; and that it carry the name of whoever supplies it and the denomination of the stone.

The three requirements serve the same purpose: a sample that is too small, too selected or anonymous proves nothing. A five-centimetre tile taken from the cleanest part of the slab is the most common, and usually unintentional, way of creating a dispute six months later: on a travertine it can show neither a hole nor a wide vein, and at delivery the hole and the vein look like defects. The moment a dispute is avoided is not delivery: it is the selection of the slab.

Fills, mesh backing, resin: defects or processing?

They are processing, and the standard says they must be declared. Where patching or fillers are used on natural holes, faults or cracks, the type of treatment and the nature of the added materials must be declared. And where processing is likely to change the characteristics of the stone, the producer must declare it: among the examples the standard names back reinforcement.

That tells you how to read a situation that comes up constantly online. A filled top is not defective; a filled top that was not declared is an incomplete supply, because a mandatory piece of information is missing. The difference is not in the stone, it is in the document.

On the back of the slab practice varies, and ours is worth stating. In our factory we do not use resin to reinforce slabs: on a large surface a support does help, and the mesh many slabs already carry on the back is a good support in itself. The point is that the choice should be stated, not discovered.

Is the slab really the one I chose?

It sounds like a paranoid question and it is not: a good share of disputes starts with a name. There is a standard here too, EN 12440: the denomination of a natural stone is made of four elements together — traditional or commercial name, petrological family, typical colour and place of origin, the last with at least city, municipality, province and country.

And it adds a sentence that explains a great deal: geographical names not related to the actual place of origin of the stone, and company names, shall be avoided. If the order carries one name only, and it is evocative, there is no denomination: there is a label. The petrological family, incidentally, is not a matter of opinion — it is established by petrographic examination — which makes the question verifiable even years later.

Which dimensional deviations are within the standard?

For slabs EN 1469 gives precise figures, and having them to hand changes the tone of a phone call. On thickness: between 12 and 30 millimetres the tolerance is ten per cent of nominal, between 30 and 80 it is three millimetres, above 80 it is five. On length and width it runs from one to three millimetres. Two millimetres of deviation on the thickness of a twenty-millimetre top is therefore not a defect. A top that does not fit the opening it was measured for is a different problem: that is not tolerance, it is a wrong measurement.

What to check in the half hour of delivery

It is worth doing before the piece is set in position, and in this order. The comparison with the sample, in hand and not from memory, in natural light and with the surface dry: wet stone, or stone lit from the side, is different stone. Edges and corners, with your fingers rather than your eyes, particularly around cut-outs and sinks. Fills, looking for them against the light, and the check that they are declared. Seams: vein alignment, flatness, constant width. The finish, which the standard requires to be uniform to the edges. The dimensions, against the order.

And then the thing that matters most of all: photograph it, with the sample beside the piece and in the same light. A photograph from delivery day is worth more than any description written a month later.

How long do you have to object?

Under Italian law the rules change according to what was signed. If the piece was bought as a product, the civil code gives eight days from discovery to report the defect, and one year from delivery as the outer limit; no notice is needed if the seller acknowledged or concealed the defect. If the piece was commissioned to measure, the contract is one of works: sixty days from discovery, two years from delivery.

In a contract of works, though, there is a rule that bears directly on this page: the guarantee is not owed if the client accepted the work and the defects were known or recognisable to them, unless the supplier concealed them in bad faith. That is why the half hour of delivery genuinely counts. Where the buyer is a consumer, the conformity guarantee of the consumer code applies in addition: two years from delivery, no obligation to report within two months — abolished in 2021 — and, where the defect appears within the first year, the presumption that it already existed at delivery; it also covers goods manufactured to order. This page reports the law and is not legal advice.

Who pays, and what can be asked for?

Three things settle it: what the sample showed, what the order said, what was declared. If the piece is within the sample and within tolerance, there is nothing to claim, however little the stone may please. If it is outside the sample, or a treatment was not declared, or the denomination does not match, the supply differs from what was agreed: replacement or repair is the discussion. And the alternative is not between keeping a broken piece and throwing it away: chips, scratches and even breaks can almost always be recovered, and stains that have gone into the stone come out.

How we work

The slab is chosen before cutting, and what the client chose stays identified. Processing that changes the appearance or the behaviour of the piece, we state beforehand. We do not reinforce slabs with resin. A damaged piece we collect, work on and put back.

Stoneform and Brianform are two divisions of the same company, with production in house: between whoever chooses the slab and whoever works it there is no commercial step, which is why a dispute can be traced back to the piece and not only to the paperwork.

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Frequently asked questions

The fabricator says it is natural. Should I believe him?

It is not a question of trust, it is a question of document. The standard says the characteristics shown by the reference sample are typical of the stone and not flaws: if the sample shows that kind of vein or hole, he is right; if it does not, he is not.

Is a filled fissure a defect?

Filling in itself is normal processing. But the standard requires the treatment and the nature of the added materials to be declared: a filled top that was declared is in order, a filled top that was not declared is an incomplete supply.

Can I refuse delivery?

If the piece differs from what was agreed, yes, and it is better not to let it be installed. If instead you sign for acceptance of a visible defect, under a contract of works the guarantee on that defect may fall away.

Is the name of the stone on the order enough?

No: the denomination is made of four elements together — traditional or commercial name, petrological family, typical colour and place of origin — and a name alone does not identify a stone.

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The standards referred to on this page are EN 1469 on natural stone slabs for cladding (reference sample, declaration of treatments and of processing that changes the characteristics of the stone, dimensional tolerances) and EN 12440 on the denomination of natural stones; the deadlines for objecting are those of articles 1495 and 1667 of the Italian civil code and of article 135-bis of the Italian consumer code, as amended by Legislative Decree 170/2021. EN 1469 covers cladding slabs and not table tops: it is cited as the European text that sets out the method by which the appearance of a natural stone is agreed and verified, a method the trade applies to tops as well. What you read here reports the law and describes how we work: it is not legal advice and does not replace the written terms of the individual order.