A Giulia Valentina is a kind of a person who is upset when she receives a different or defected product than what she ordered.
The term refers to when Giulia Valentina bought a Fornasetti candle with a bee on the nose, making sure with the customer service that she would receive that particular one and they sent her a different candle with butterflies.
"I ordered a flour sieve on Amazon. It was delivered late and also broken. I asked for a refund. I'm such a Giulia Valentina right now."