This is the mistake that costs people the most in both directions. Asking prices on eBay or Etsy tell you what optimistic sellers hope for; many of those listings sit unsold for years. What matters is completed sales. On eBay, filter search results to "Sold Items" and you'll see what buyers actually paid in the last 90 days. Three or four sold comparables in similar condition give you a realistic range.
The difference between "old vase" and "Roseville vase" can be a hundredfold. Flip the item over: pottery and porcelain carry maker's marks on the base, silver carries hallmarks, furniture often has labels or stamps in drawers or on the underside. Photograph any mark you find and search it — collectors have documented most marks extensively online. If there's no mark, construction details (dovetail joints, screw types, glass pontil marks) still date a piece.
Condition moves value more than most sellers want to believe. A chip, a hairline crack, replaced hardware, or a refinished surface can cut value by half or more — while original finish and original parts, even worn, often command a premium. Collectors generally pay for honest age over bad restoration. When you compare your item to sold listings, compare condition-to-condition, not just object-to-object.
Values move with generations. Heavy "brown furniture," formal china sets, and collector plates have been soft for years because the generation that loved them is downsizing all at once. Meanwhile mid-century modern pieces, vintage video games and toys, costume jewelry from named designers, and unusual everyday objects from the mid-1900s often outperform what their owners expect. The point isn't to memorize trends — it's to never assume. The boring box in the garage routinely beats the formal cabinet in the dining room.
The traditional options were paying an appraiser per item or per hour — which only makes sense for genuinely valuable pieces — or spending your evenings researching items one by one. AI appraisal now covers the middle ground: a photo gets you a category, condition assessment, and realistic value range in seconds, which is exactly what you need for the hundreds of ordinary decisions in a downsizing or estate cleanout. For items that turn out to be significant — fine art, important jewelry, anything you'd insure — take the next step and hire a certified appraiser for a formal written appraisal. The smart workflow is triage: appraise everything fast, then invest expert money only where the fast answer says it's justified.
Stop guessing one item at a time.
SellSmart AI gives you an appraisal with a realistic value range — plus a ready-to-post listing — from one photo in about 15 seconds.
One rule covers every situation: never accept an offer on an item you haven't priced. "I'll give you $50 cash right now" is a sentence designed for people who don't know their number. Once you do know it, that same sentence becomes the start of a negotiation you can win — or walk away from.