Described a pendant as sterling silver, just realised it's not....

[izzium]

I'm new to selling and just listed a pendant as sterling silver.
The little clasp bit holding the pendant to the chain is hallmarked but the pendant has not got a hallmark and I think it's just metal with diamante on the front.

I would change the listing but I already have a bidder. Can she withdraw her bid if I change it or can I contact her?

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change the listing and then let her get out of paying if she does end up being the highest bidder if she doesn't want it

just change your listing on the description part. no biggy

Thank you!