There is no grading service for textiles and no numbered ladder. What there is, is a short list of the places a saree actually fails.
The words
New — unworn, with any tags or original fold. Worn once — and say so, rather than calling it new. Pre-owned — worn, with the wear described. Vintage — an age, not a condition. Give the condition separately.
The three places that decide it
The folds. Silk weakens along a crease, and a saree folded the same way for years splits there. This is where a vintage piece fails and the first place to look.
The zari. Tarnish, blackening, pulled threads, and whether any of the metal thread has come away.
The borders and the pallu. Fraying, pulls, and any repair.
Then the rest: stains located and sized, holes, tears, watermarks, colour bleeding, and whether it has been dry-cleaned. Describing sarees.
Facts that are not condition but belong in the listing
Handloom or powerloom, and how confident you are. Blouse piece present or not. Seam allowance left, because it decides whether a buyer can have it altered.
Why a number fails
Because a saree can be perfect in the body and gone at one fold, and the fold is the part that matters.
Questions people ask
Does a small stain ruin it?
No. Show it, place it, price for it.
Is a repaired zari border a problem?
Only undeclared. Say what was done.
Can I describe it as "pure silk"?
Only if you can support it. Otherwise describe what you see.
More: buying sarees, what one is worth.