Online viewing is the digital preview of auction lots through web-based catalogues, high-resolution photography, video, and downloadable condition reports, allowing prospective bidders to inspect property remotely before placing bids. The practice now sits at the centre of how major auction houses market and transact, supplementing — and in many cases replacing — the traditional in-person pre-sale exhibition. Online viewing expanded dramatically during the COVID-19 pandemic, when physical exhibitions were impossible, and the audience habits formed in that period have proved durable: even with galleries reopened, a substantial proportion of bidders never see the lots in person before bidding.

What an online viewing typically provides

For a fine jewellery or coloured-stone lot, a serious online viewing package includes a written catalogue entry with weight, measurements, identification, and provenance; multiple high-resolution stills under controlled lighting; a 360-degree turntable video; macro views of any signed mark, hallmark, or inclusion of note; and a downloadable condition report describing wear, restoration, and any laboratory documentation. The most rigorous houses also provide UV imagery for organic materials, refractive-index and specific-gravity tests for unidentified stones, and laboratory reports from GIA, SSEF, Gübelin, AGL, or Lotus Gemology where the lot warrants it.

Catalogue presentation has standardised across Christie's, Sotheby's, Phillips, and Bonhams. Each site provides a zoomable still, a turntable video, and a structured condition report. Below the major houses, regional auctioneers vary widely in the depth of their online presentation, and a sparse listing — single low-resolution image, no video, no condition report — is itself a useful piece of information about the level of vendor support behind the lot.

What it cannot replicate

Online viewing has limits that any experienced buyer recognises. Colour in coloured stones is the most obvious: a photograph compresses the dynamic range of a fine ruby or sapphire and rarely conveys the subtle hue shifts, the strength of pleochroism, or the way the stone reacts to different light sources. Fluorescence in diamonds, the precise quality of an opal's play of colour, and the depth of a pearl's lustre are all under-represented in even the best photography. Inclusions are sometimes more visible in good macro imagery than in a hand-held loupe view, but their effect on the stone's overall appearance is much harder to judge from a screen.

Condition reports help fill the gap. A well-written report from a knowledgeable specialist will note small chips at the culet, hairlines in enamel, restorations to a clasp, and the like. Less reliable houses produce thin condition reports that disclose problems only when pressed. For substantial lots, requesting a supplementary written condition report is standard practice and forms part of a buyer's due diligence.

Pandemic acceleration and durable change

The 2020 lockdowns forced an industry-wide migration to online viewing. Christie's, Sotheby's, and Phillips moved their entire pre-sale exhibition programme online within weeks, supplementing existing digital catalogues with newly commissioned video and additional photography. The April 2020 Phillips New York jewels sale, conducted entirely without physical viewing for many participants, demonstrated that bidders would commit at high values on the strength of digital presentation alone, provided that the cataloguing was rigorous and the condition reporting transparent. Subsequent sales reinforced the lesson, and in-person exhibitions reopened to find a permanently smaller share of the bidding audience.

The change has been most pronounced for international bidders, who never participated in physical viewing in any meaningful proportion. For a buyer in Hong Kong looking at a Geneva sale, online viewing was always the only viewing, and the post-pandemic improvements in imagery have made the experience materially better than the catalogue-and-fax-machine era of the 1990s.

In the trade

For most lots, online viewing combined with a downloaded condition report is enough information to bid sensibly within the published estimate. For lots above approximately one hundred thousand United States dollars, or for stones whose colour or condition would materially shift value, an in-person viewing — by the buyer or by a trusted agent — remains advisable. The auction houses generally accommodate private viewings outside scheduled exhibition hours for serious bidders. The principle is the same as it has always been: more information reduces risk, and online viewing is one tool, not a complete substitute for hands-on inspection of the most important pieces.

Further reading

• GIA Gems & Gemology — auction and laboratory standards
• International Gem Society — buying coloured stones
• GIA — diamond and coloured-stone reports