The lot description is the prose, almost always backed by photographs and sometimes by a laboratory report, that the auction house publishes for each item it offers. It is at once a commercial pitch, a technical specification, and a legal declaration. Buyers rely on it to bid; the auction house relies on it to discharge its limited warranty obligations under its conditions of sale.

Anatomy of a jewellery description

A typical jewellery lot description in a major-house catalogue will name the maker if attributed, give the period if attributable, identify the principal gemstones with their stated weight and any laboratory grading, identify the metal, describe construction and signed/numbered marks, and note condition where relevant. Christie's, Sotheby's and Bonhams use carefully calibrated language - 'attributed to', 'signed', 'in the manner of', 'after' - which carries different weight in their conditions of sale.

What the description warrants and does not

Standard auction conditions warrant the catalogued attribution within a stated period (typically five years for major houses) but disclaim warranties of condition, weight, treatment, and restoration unless explicitly stated. Where a laboratory report is referenced, the auction house typically warrants only that the report exists and that the description is consistent with it, not the laboratory's findings themselves.

Reading the description critically

Specialist buyers read lot descriptions for what is omitted as carefully as for what is stated. Absence of an origin determination on a Burmese-style ruby, absence of a heat-treatment statement on a sapphire, or vague phrasing such as 'natural colour' without supporting documentation, are all material signals. Conversely, explicit phrasing such as 'no indications of heating' from a named laboratory carries direct weight in the price the lot will achieve.