Just before 1.30am, a man entered a supermarket on King Street, and allegedly threatened a female employee with a syringe.
He demanded cash and cigarettes before jumping the counter and taking four mobile phones.
The man fled the scene.
Then shortly before 4am, a man allegedly smashed the front window of a jewellery shop on Kenrick Street, The Junction, before taking several pieces of jewellery.
He was arrested, and refused bail to face Newcastle Local Court today.