Certificates of Authenticity: What They Prove and What They Do Not

Ask about authenticity in a gallery and you will usually be handed a card. It may be printed on heavy stock, embossed, and signed with a flourish. None of that is the point. A certificate of authenticity is a statement made by a specific person about a specific object, and its entire value rests on two questions: what does it actually say, and who is in a position to say it?

What a certificate is

It is a written assertion that a named work is by a named artist. That is all. It is not a valuation, not a guarantee of resale, and not proof of anything in itself — it is testimony, and testimony is worth exactly as much as the person giving it.

A certificate signed by the living artist who made the work is close to conclusive. One signed by the gallery that represents them is strong. One signed by an expert committee or the artist's estate, for a deceased artist, is the gold standard and often the only accepted proof. One signed by an unnamed "authenticator" you cannot look up is worth the card it is printed on.

What has to be on it

A certificate that omits any of the following is doing an incomplete job:

• The artist's full name, as they sign it.
• The title of the work, and its year.
• The medium and support — "oil on linen", "digital print on art photographic paper", not "mixed media" and nothing else.
• Exact dimensions, in centimetres, height before width, and depth for anything three-dimensional.
• The edition number and edition size, for anything printed or cast, plus the number of proofs outside the edition.
• An image of the work, ideally, so the certificate cannot later be attached to a different object.
• The issuer's name, capacity and signature — who they are, and on what basis they are making the statement.

The last one is the one most often fudged. "Certified authentic" over an illegible squiggle tells you nothing. A named gallery, with an address, stating that it represents the artist, tells you a great deal.

The invoice matters as much as the certificate

This is the part most guides skip. In France, a detailed invoice from a professional seller is a serious document: it records who sold what to whom, when, for how much, and it exists in the seller's accounts as well as your drawer. For an insurer, a future buyer or an estate, that invoice is often more useful than a decorative certificate.

So ask for the work to be described properly on the invoice, not as "artwork" or "one item". Artist, title, year, medium, dimensions, edition number. It costs the seller nothing and it converts a receipt into a record.

Keep both, together, and photograph them. A certificate separated from its work is close to worthless, and the commonest way that happens is a house move.

Provenance is the other half

Provenance is the chain of ownership and exhibition: who has owned the work, where it has been shown, whether it has been published. For contemporary work bought directly from a gallery, the provenance is short and simple — you are the first owner, and the invoice starts the chain. That is a good position to be in, and it is one reason buying from a primary gallery is cleaner than buying at the third remove.

Where a work has passed through several hands, ask for what documentation exists. Gaps are not automatically sinister; a 1970s print will rarely have a complete paper trail. But a work presented as significant, with no history at all and no explanation for the absence, deserves scepticism.

What to be wary of

A certificate for an open edition. If the print is unlimited and unnumbered, there is nothing meaningful for a certificate to certify beyond "this is a reproduction of an image by X". Certificates are sometimes attached to open editions purely to create an impression of collectability.

Certificates issued by the seller about a third party's work. A reseller who did not make the work, does not represent the artist and has no expert standing is asserting something they are not positioned to know.

Prominent numbering with vague attribution. "Edition 47/500, after the artist" is a reproduction, and "after" is the word doing the work.

A certificate offered instead of answers. If a seller responds to questions about process, edition or provenance by pointing at the certificate, the certificate is being used as a conversation-ender rather than as evidence.

What if there is no certificate?

Below a few hundred euros, a signed and numbered print bought from a gallery or an established online seller, with a properly detailed invoice, is a perfectly normal transaction. Not every legitimate work arrives with paperwork, and demanding a certificate for a €60 print will mostly get you a certificate printed that morning.

Above that, the calculus changes. For anything into the thousands, and for anything you might one day insure or resell, documentation is part of what you are buying. Ask before you pay, not after — a seller who will not put a description on an invoice before the sale is unlikely to become more helpful once the money has moved.

And what a certificate will never do

It will not tell you what the work is worth. Nothing about authenticity implies value: a genuine work by an artist nobody collects is genuinely worth very little, and a certificate does not change that. For a figure that carries weight with an insurer or a tax authority you need a qualified appraiser, and that is a separate document, a separate fee and a separate profession.