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Did you open a dispute for item received but not as described? ie you got a bait and switch ring?
Or did you open one for non receipt which any seller would win if they provided tracking?
You are only allowed 1 dispute per transaction so the only way you can get a second dispute opened is to contact Paypal (when and if you can) and see if they will open a second dispute for you.
They may decline citing policies but if you say what happened then they might open a second dispute for you.
If not then if you funded your paypal payment via a credit card then consider contacting your card issuer and see if they will help you with a chargeback?