Art valuation is not a single number. The figure attached to a painting, manuscript or jewel depends on the purpose of the valuation, the market being considered and the standard being applied. Understanding the main types of value helps collectors ask for the right one and interpret it correctly.
The Auction Estimate
An auction estimate is a range, for example a low and a high figure, published alongside a lot. It represents a specialist’s opinion of what the object is likely to achieve in a competitive public sale. Estimates are based on:
- Results for comparable objects
- Quality, rarity and condition
- Attribution and provenance
- Current collecting demand in that field
Estimates are also strategic. A conservative estimate may encourage wider participation. The reserve, the confidential minimum, is normally set at or below the low estimate. An auction estimate is not a formal appraisal and is not designed for insurance or tax purposes. To see how estimates are presented in practice, browse our current auctions.
Insurance Replacement Value
An insurance valuation answers a different question: what would it cost to replace this object with one of similar type, quality and condition within a reasonable period? Because replacement often means buying from a dealer, insurance values are commonly higher than auction estimates.
For unique items such as a signed calligraphic panel or an illuminated Qur’an section, true replacement may be impossible. Here the valuer considers the cost of acquiring a comparable work, and the policy wording becomes especially important.
Keeping Insurance Values Current
Markets move. A value set many years ago may leave a collection underinsured or overinsured. Regular review, supported by good photographs and documentation, is sensible practice.
Fair Market Value
Fair market value is a defined standard, widely used for estates, charitable donations and tax matters. A common formulation describes it as the price at which property would change hands between a willing buyer and a willing seller, neither under compulsion and both with reasonable knowledge of the relevant facts.
The precise definition and requirements vary by jurisdiction. Formal appraisals for these purposes are usually prepared by qualified appraisers following recognised professional standards, and the written report must often document methodology and comparables.
Other Values You May Encounter
- Marketable cash value: what an owner might realise from a sale, net of costs, sometimes used for division of property.
- Probate value: a valuation for estate administration, subject to local rules.
- Private treaty price: a negotiated figure agreed between buyer and seller outside the auction room.
Choosing the Right Valuation
Start with the purpose. If you are considering a sale, an auction estimate from a specialist is the natural starting point; you can request one through our consignment service. If you need cover, ask for an insurance valuation. For estates or donations, consult a qualified appraiser and your legal or tax adviser.
Whichever type you request, provide full documentation. Provenance, previous invoices and condition information all shape value. Specialists in fields such as Islamic and Ottoman arts will also weigh attribution and scholarly literature carefully.
Frequently Asked Questions
Why is an insurance value often higher than an auction estimate?
Insurance values usually reflect the cost of replacing an object through the retail market within a reasonable time, which tends to exceed what a seller would expect to receive at auction.
Can I use an auction estimate for an estate or tax filing?
Generally no. Tax and estate matters normally require a formal written appraisal prepared to the standards of the relevant jurisdiction by a qualified appraiser.
How often should a collection be revalued?
Markets change, so many collectors review insurance valuations every few years, or sooner after major market shifts or new acquisitions.
