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.
If I can be of any further help, please feel free contacting me. And if you would like to use me on any further questions, feel free putting my name ( Glenda ) in your question line, then I will be sure to get it. Look forward to working with you again.
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The cost of questions is determined by what kind of question you ask, I am not sure of cost structure, it is determined I believe by what amount of information a person whats, such as just a value, or a value and history etc. You could probably email customer service and they can explain it better then I , I am not on that end of it.
Here is what the inside of the booklet looks like, the booklet does not give the item number. The price for this bowl is 250.00.
What the signature looks like on the bowl up close...