Does your certificate look like this one, if so that is authentic,( does not mean someone did not have one to put with a bowl that may not be Murano ) it is normal to have a clear plastic sticker on the inside of the bowl that says. Murano on it. Also an authentic one that is signed will have the signature of Sergio Costantini on the bottom of the bowl.
These bowls are expensive, so I would be sure it has all of this on it, if it is not signed then I think I would go back to the store and ask them about this.
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