No. AI cannot reliably date, authenticate or value an antique from photos or notes, and whatever it states in your listing becomes your statement to the buyer. It is safe for drafting listings from your own notes, organising research and sold prices you supply, tidying records, and wording provenance so it claims only what you can evidence.
The reason is mechanical. A model sees a photo, not the object. It cannot turn the piece over, check the tool marks inside a drawer, judge patina or weight, or smell a repair, and it answers in the same assured tone whether it is right or wrong. OpenAI's own terms tell users not to treat output as a sole source of truth. Published accuracy claims for identification apps come from the apps' makers, and I could not find an independent test.
The three jobs to keep away from AI
Authenticating: the object is not in the photo
A photo shows what a camera can reach. What dealers check lies elsewhere: the underside, drawer interiors and back boards, tool marks, wear where hands and feet touch, weight, smell, and signs of repair under ultraviolet light. No app can guarantee authenticity, and attribution, period dating and a valuation that turns on condition all depend on someone with the object in their hands.
Marks are a special case. OpenAI says images are resized before analysis, so a maker's mark a few millimetres wide in a whole-object photo may arrive as a smudge. Crop tightly to the mark, light it from the side, and treat any reading as a lead to check against a reference book or a specialist.
Here is how a mark goes wrong, as an invented case. A dealer photographs the base of a small silver-plated dish and asks an assistant what the mark says. It names a well-known maker with confidence, and the dealer lists the dish as marked by that maker at $480. A buyer's reverse image search shows the stamp is a common retailer's mark used on thousands of dishes, and the dish is worth about $95. The $385 gap is what a refund and a damaged reputation cost, and it came from treating a reading as a fact. The check was two reference sources agreeing, with the mark photographed under magnification, before the word "marked" went anywhere near the listing.
Dating: a date needs evidence the camera misses
A dealer photographs an oak gateleg table and asks an assistant for a date; the figures here are invented to show the mechanism. The reply says "circa 1780" with some confidence. On the bench the dealer finds curved arcs from a circular saw on the underside, a drawer back held with wire nails, and a top fixed with uniform machine-made screws. Together those details point to the early 20th century, and none was visible from the front. Listed at $1,800 as 18th-century, it would come back. Refund $1,800, pay $140 return freight, receive a table worth about $220: a $1,720 hole in one sale, before marketplace fees.
Valuing: a guess is not a sold price
Ask "what is this worth?" and a model produces a range that sounds precise and rests on nothing you can inspect. It has no sale records for your specific piece in its specific condition, and a figure you cannot trace is a figure you cannot defend to a buyer or a bank. The safe version of the job is further down: you supply sold results, and the assistant arranges them.
What it is safe to use AI for, from lowest risk to highest
| Job | What you give it | What can go wrong | Your check |
|---|---|---|---|
| Condition reports in a fixed layout | Your bullet notes | It smooths over a flaw or adds "good condition" | Every flaw in your notes appears in the text |
| Photo shot lists and alt text | Item type and what must be shown | Alt text describes things that are not there | Read it against the photo |
| Stock record tidying | A spreadsheet export | Categories merge that should stay apart | Spot-check ten rows |
| Listing drafts | Your notes only | It adds dates, rarity and history | Delete anything not in your notes |
| Sold-price tables | Sold results you collected | Arithmetic errors, wrong outlier choice | Recompute the median yourself |
| Research questions and glossaries | An object description | A rule stated as universal | Confirm in a reference book or with a specialist |
| Provenance wording | Your evidence, labelled by source | It fills a gap with a plausible story | Every claim has a named source |
| Replies to customer enquiries | Your own record of the item | It promises more than the record says | Read it as the buyer would |
The pattern is that AI is safe where it rearranges facts you already hold and dangerous where it supplies facts you do not. AI Tools for Cataloguing Stock: From Photos to Item Records covers the records side in more detail.
A listing draft that cannot invent a date
Start with notes in your own words. They are the only source the assistant may use. An illustrative set for the table above:
Oak gateleg table. Four turned legs, two swing gates, two drop leaves, one end drawer.
Open 138 x 106 cm, closed 38 x 106 cm, height 73 cm.
Top: two ring marks and a 12 cm split along the grain at one end.
One later brass castor on a front leg. No maker's label or stamp seen.
Underside planed, curved saw marks, drawer back wire-nailed.
Bought at a house clearance, vendor said "old", no papers.
My view: early 20th century, probably, not tested. Ask $195.Write an eBay listing from my notes. Use only the facts in the notes. Do not add a date,
maker, style name, rarity claim or history that is not there. Where my notes say "probably",
keep the hedge. Title under 80 characters. Description in three short paragraphs: what it is
and its size; condition, with every flaw; what I do not know. No words like rare, stunning,
charming or museum-quality.An illustrative first draft returns the title "Oak gateleg dining table with drop leaves, probably early 1900s, split to top" at 77 characters, inside eBay's 80. The description gives the dimensions, lists both ring marks, the 12 cm split and the later castor, says no maker's mark was found, and ends: "We believe it is early 20th century, from its construction and wear, but it has not been tested or documented."
That last sentence shows what to fix. Your notes gave a view, not a reason, so "from its construction and wear" is the assistant's addition. Change it to your own wording ("in our view, probably early 20th century"), and delete any phrase such as "beautiful patina" or "a charming addition to any dining room" that creeps in despite the instruction. Before sending, check each flaw in your notes appears in the text, because an omitted split is how a refund request starts. The condition layout is worked through in AI for eBay Descriptions: A Condition, Flaws and Measurements Template.
The time saving is real. At 20 minutes a piece by hand and 8 with a notes template and a draft to correct, 40 new pieces take 13.3 hours against 5.3, saving 8 hours. The saving comes from the template and the draft, never from skipping the notes.
Research prompts that decide nothing
Use an assistant as a study aid. Ask it for features and questions, never a verdict.
I am researching a pair of cut-glass decanters with a star-cut base and mushroom stoppers.
List the features dealers examine to separate 19th-century pieces from later copies, and the
questions I should ask a specialist. Do not give me a date or a value.An illustrative reply lists mould seams against hand-finished surfaces, the weight and sharpness of cutting, whether the base is polished or ground, whether the stopper fits its own neck, and how wear sits on the foot. That list is useful because you can run it with the decanters in your hands. What to check: the reply may present a rule as universal when it is only common, and may mix features from different periods. Look up each feature in a reference book, or ask the specialist whether it holds for this type.
The same approach drafts the email to that specialist. Give it your observations and ask for three questions and a list of photographs to attach. A good draft describes what you see ("curved saw marks on the underside") and asks, rather than claims ("this is 1780"). Keep the observations factual so the expert reads evidence, not a sales pitch.
Sold prices: let AI arrange the evidence, never invent it
Collect sold prices, not asking prices, from your own sales records, auction results you can access and a marketplace's sold-listing research. eBay's Product research tool (also called Terapeak) shows the prices similar items actually sold for over the last three years, including accepted Best Offers. Paste in the rows and let the assistant tabulate and calculate.
Illustrative case: six sold results for oak gateleg tables of a similar size. $180 (split top), $205, $220, $240, $260 (cleaned and in excellent order) and $410 (with a dated receipt from the maker's workshop). The mean is $252.50, the median $230 and the mean without the highest and lowest $231.25. The assistant can produce all three, but the decision about the $410 is yours: it has documentation your table lacks, so it is not a like-for-like comparison. Without it, the five like-for-like results have a median of $220. Take 10% off for the split and ring marks and you get $198, so the ask of $195 in the notes has a trace you can show. In a spreadsheet the check is =MEDIAN(B2:B6), so recompute rather than trust the chat. eBay Magical Listing Checklist: Test AI Item Specifics Against Sold Data shows the same habit applied to marketplace tools.
Provenance wording: what you know, how you know it, then stop
Provenance is the documented history of an object's ownership. Most stock has little. The honest wording says what you know, how you know it, and where the knowledge ends. A sentence has three parts: the claim, the source and the status. Auction houses publish their own definitions of terms such as "attributed to", "circle of", "manner of" and "after", and those definitions differ between houses, as does the weight they carry if a sale is disputed, so use only phrases you can support and keep your evidence on file.
| What you actually know | Wording you can support | Wording to avoid |
|---|---|---|
| A signature is visible; you cannot verify the maker | Signed "[maker]" on the base (signature not verified) | By [maker] |
| A named specialist gave you an opinion in writing | Attributed to [maker] by [specialist], [month year]; letter on file | Attributed to [maker], with no source |
| It resembles a maker's work, nothing more | In the style of [maker] (not by them) | School of [maker] |
| The vendor told you its history | The vendor states it was bought at auction in the 1980s; no documents seen | Provenance: bought at auction, 1980s |
| You hold the auction invoice | Bought at [auction house], [month year], lot [number]; invoice on file | Fine provenance |
| You judge age from construction | Probably early 20th century, from construction and wear; not tested | Dated 1905 |
| Marks are present | Struck with marks as photographed; not identified | Hallmarked by [maker] |
| It has repairs or replacements | Later replacement handles; old repair to one leg | Original condition; excellent condition |
The assistant's job is to draft sentences from this pattern, and the instruction that matters is the ban on filling gaps.
Turn these notes into one provenance paragraph. Use only facts in the notes. For each
statement say who says so: the vendor, an invoice, or my own inspection. Do not infer a date,
maker or history. Where something is unknown, write "not known". Do not use the words rare,
important, fine, museum-quality or authentic.An illustrative reply: "Bought at a house clearance in [month year]. The vendor described it as 'old' and supplied no papers. No maker's label or stamp was found on inspection. Date: our view is early 20th century, from construction; not tested. Earlier history: not known." What to fix: a first draft may add "likely a family piece" because house clearances often involve families. Delete it. If a word such as "genuine" or "authentic" appears, remove it too, since it reads as a guarantee you would have to honour in a dispute. Ask a solicitor how misdescription rules apply to your own sales terms.
Capture provenance at the point of purchase
Provenance you can state later depends on what you write down when you buy. A seller's own words, noted on the day, are evidence; the same words reconstructed from memory six months later are not. Keep one buying note per piece and photograph any paper the seller shows you. An illustrative note for the gateleg table:
| Field | Entry |
|---|---|
| Bought | House clearance, [date], $60 for the table |
| Seller's own words | "It was in the back room for years. I think it came from his mother's house." |
| Papers seen | None |
| Photographs | Nos. 41 to 52: top, underside, legs, castor, split, drawer |
| My inspection | Planed underside, curved saw marks, drawer back wire-nailed |
| Not known | Age, maker, earlier owners |
With the note in front of it, an assistant can write the provenance paragraph from the earlier prompt, and every statement traces to "the seller", "a document" or "my inspection". At three minutes a note, 15 pieces from a clearance take 45 minutes to record. That feels like a lot until a buyer disputes one piece, and you are the dealer who can show what was said and seen on the day.
Replying when a buyer asks "is it original?"
Buyers ask this about almost everything, and it is the question where an assistant's helpfulness does the most damage, because "yes, it looks original" is exactly the phrase a model produces. Give it your record and ask for a reply that states only what the record says.
A buyer asks whether the table is original. Reply using only my notes below. Say what I know,
how I know it and what I do not know. Do not use the words original, genuine or authentic.
Offer extra photographs of the underside, the drawer and the castor.An illustrative reply: "Thanks for asking, [first name]. In our view the table is probably early 20th century, judging by its construction. We have not tested it and have no papers, so we cannot say more than that. We can send more photographs of the underside, the drawer and the castor if that helps." What to check: that none of the three banned words appears, that the reply offers evidence rather than reassurance, and that it does not repeat the seller's remark about a family home as if it were established. If the buyer then wants a firm statement, the honest answer is to point them to a specialist who will examine the piece.
Photos: what editing may touch
Cropping, straightening, correcting a colour cast and a plain background are routine. Altering what the object looks like is not: removing a scratch, smoothing wear, warming the patina or adding a feature misdescribes the piece, and a buyer who receives something different from the photographs will ask for a refund. Keep the unedited originals, show the underside, marks and flaws as separate shots, and put a ruler or a coin in frame. Marketplaces set their own picture rules, so read Can You Use AI Photos on eBay? What the Picture Policy Says before you use any AI-generated or AI-edited image in a listing. Marketplaces allow only a limited number of photos (eBay's limit is 24), so use them for evidence, not mood.
Checks no chatbot can clear
Some materials and object types are restricted in sale, and the rules depend on the material, the date and the place. Ivory, tortoiseshell and certain woods are the usual examples. An assistant cannot clear an item for sale, and a confident "this is fine" is exactly the answer that can cost you the stock and a penalty. Ask the relevant authority or a specialist, and keep the paperwork. Higher-value pieces also deserve a check against a registered database of stolen property before they go on sale, which is a job for the register, not a chat. For more on where AI-drafted listings mislead, see AI Listing Mistakes That Can Mislead Buyers, and How to Check, and for a trade that already uses AI heavily for descriptions, AI for Auctioneers: Lot Descriptions, Consignor Updates and Buyer Emails.
How the rule plays out in three kinds of antique business
A walk-in shop with mixed stock. The work is volume: price tickets, a simple online listing for each piece and replies to enquiries. AI saves the most time on condition notes and listing drafts, and the risk is a descriptive flourish on a ticket. The rule is that every ticket line comes from the buying note, not from the assistant's imagination.
An online specialist in a field with marks, such as clocks or silver. Buyers read these listings closely, and the marks carry the value. AI can structure the description and draft the email to a specialist; it cannot read a mark. The rule is to crop the mark, check two references, and word the listing "marked as photographed" until you have.
A fair or market dealer with a table of small pieces. Speed matters more than polish. Use AI for a one-line card per item and a standard condition phrase, and keep the buying notes ready for any buyer who asks for documentation. At 60 items, two minutes a card by hand is two hours; with a card template and a drafted line it is about one.
One page for the shop: green, amber, red
| Green: do it freely | Amber: do it, then check | Red: never |
|---|---|---|
| Tidy stock records and categories | Listing drafts from your notes | Authenticating a piece |
| Shot lists and alt text for photos you took | Sold-price tables from results you collected | Dating a piece from a photo |
| Newsletter and social posts from finished listings | Research questions and specialist emails | Putting a value on a piece, or on a customer's |
| Replies to postage and opening-hours questions | Provenance sentences from labelled evidence | Writing a certificate of authenticity |
| Packing and postage checklists for fragile pieces | Condition reports in a fixed layout | Editing a photo so the piece looks better than it is |
Print the table and pin it by the bench. The simplest test for any new job is the one this whole page rests on: is the assistant rearranging facts you hold, or supplying facts you lack? If it is supplying them, the job is red.
Antique dealers' questions about AI
Can I use Google Lens or an identification app to date stock?
Use them to find leads, not conclusions. A match shows you similar items and reference images to check against the real piece. The accuracy figures on app makers' pages come from the makers, and I could not find an independent test, so treat a suggested date or maker as a hypothesis until marks, construction and a reference book agree.
Can AI write a certificate of authenticity for a piece?
It should not. A certificate is a promise that you stand behind, and an assistant has no way to inspect the object or hold you to the claim. Write a plain description of what you know and how you know it. If a buyer wants an authentication, point them to a specialist who will examine the piece and put their name to a report.
How do I price a piece with no sold comparables?
Widen the net before you guess: similar pieces by type, period and quality, then adjust for condition. Ask a specialist dealer or an auction house for a verbal opinion on the harder pieces. An assistant can structure the comparison table you build, but the price is your call and should rest on sold results you can show.
Can AI help me spot reproductions?
It can list the features dealers check, such as tool marks, joinery, hardware and wear, and turn them into a checklist for your bench. It cannot confirm any of them from a photo. Run the checklist on the object, with a magnifier and a UV torch if you have one, and ask a specialist about anything that does not add up.
What should I say when customers ask what their item is worth?
Say it is an informal opinion, not a valuation, and say what you would pay or ask for it today. Insurance, probate and dispute valuations are professional work for a qualified appraiser. Do not paste a customer's photos into a chatbot and relay a figure; the number would carry your name without any evidence behind it.
Further reads
- How to Write eBay Listings With AI That Sell Faster — Titles and descriptions that sell, once the facts are right.
- How Resellers Use AI to List Second-Hand Items Faster — A faster listing routine for second-hand stock.
- ChatGPT Prompts for Jewellery Shops: 8 for Listings and Clients — Prompts for another trade where marks and materials matter.
- AI for Thrift Stores: List Donated Items From a Phone Photo — Listing donated items from a phone photo.
- Charity Shop Pricing: Price Donated Items Faster With AI — Pricing mixed donated stock quickly with sold evidence.
- Game Store Software: Trade-Ins, Tournaments and AI Product Listings — Game store software compared on trade-ins, event sign-ups and listings, with price-sheet and event-fee sums and the AI jobs worth doing.
- Record Store Software: Catalogue Used Vinyl and Track Stock With AI — A one-row-per-copy sheet, a shared grading standard, AI-drafted listings and a pricing check you do yourself, worked through on a 40-record box.
- AI Tools and AI Development: The Complete 2026 Guide — the AI hub, including every tutorial in the AI-for-business series.
Sources: OpenAI terms of use and ChatGPT image inputs FAQ (output is not a sole source of truth; images are resized before analysis); eBay listing limits (80-character titles, 24 photos) and eBay's Product research help page. Worked figures are illustrative.