How to buy a masterwork privately — and verify it's real

Most of the great works never reach a public auction. A Picasso, a Krasner, a Monet — the finest pieces move quietly, collector to collector, often before the wider market ever hears they are available. For the private buyer, that creates both the opportunity and the risk: you can acquire something extraordinary, but the burden of proving it is real sits with you.

The art world is also one of the most forgery-prone markets on earth. So before you buy a masterwork privately, you need to understand the hierarchy of proof — and never confuse one level for another.

The five levels of art authentication

Not all "documentation" carries equal weight. From weakest to strongest:

1. The seller's word

Worth nothing on its own, however convincing. Every serious process begins by setting this aside entirely.

2. An appraisal

An appraisal tells you what a work is worth — but most appraisals value a piece assuming it is authentic. They do not prove authenticity. This is the single most common misunderstanding among new buyers: a $5 million appraisal is not a $5 million guarantee the work is real.

3. A forensic or provenance report

A laboratory examination of materials, pigments, canvas age, and documented ownership history. Genuinely useful, and a serious step — but still not the final word for a major attribution.

4. The catalogue raisonné

This is the gold standard. A catalogue raisonné is the definitive scholarly record of every authenticated work by an artist. For Picasso, the principal reference is the Zervos catalogue, spanning 33 volumes. If a work is listed in the recognised catalogue raisonné — with a volume and catalogue number — it has been documented by scholars as genuine. If it is not in any catalogue raisonné, that is a serious question to resolve before proceeding.

5. The estate or foundation certificate

For some artists, a dedicated authority issues the final word. For Picasso, that is the Picasso Administration. A certificate from the recognised estate body is the highest level of assurance a buyer can hold.

What "provenance" actually means

Provenance is the documented chain of ownership — ideally unbroken — from the artist's hand to the current seller. Strong provenance includes invoices, exhibition records, gallery labels, and a clear line of every owner along the way. Gaps in provenance are not automatically disqualifying, but each gap is a question that needs answering, especially for high-value works.

The questions every private buyer should ask

• Is the work listed in the recognised catalogue raisonné? Which volume and number?
• Is there a certificate from the artist's estate or foundation?
• What is the full, documented chain of ownership?
• Has the work been examined by an independent, recognised forensics laboratory?
• Is the seller the legal owner with clear title, free of liens or disputes?
• Can my own experts inspect the work in person before any commitment?

A genuine seller of a genuine masterwork welcomes inspection. Pressure to skip verification is the clearest warning sign there is.

How the acquisition should be structured

Private art transactions at this level move through protected channels: a non-disclosure and non-circumvention agreement before introductions are made, independent verification by the buyer's own experts, and funds held and released through escrow at completion — never paid in advance to "secure" a piece. You should never have to pay anything simply to participate.

Done correctly, buying privately gives you access to works that never touch the public market, at terms an auction room could never offer. Done carelessly, it is how fortunes are lost. The difference is entirely in the verification.