You've only been together for 2 months. Get her something small. You don't want to get her something big because that's creepy. Spend no more than $30. Save expensive jewelry for yearly anniversaries.
I will do my best to reply with an educated, humble and honest answer. Ultimately, it is up to you whether you want to listen to my advice or ignore it completely. Sometimes, my advice may be wrong; occasionally, it will be right. Regardless, I want to do my best to give people answers they are seeking.