Don't file the snit out of it! Lol. It's a very pretty piece. What's it marked? Looks real...
Are you using a file or the streak plate for filing? If it's not marked you probably should file a little groove to make sure it's not plated or filled. Check the ring that's connected to the ring on the charm; if that ring is soldered closed and not simply bent closed your chances of it being real gold go up. Anyone working with real gold wouldn't trust a piece of bent metal - they'd want a solid ring.
Are you using a file or the streak plate for filing? If it's not marked you probably should file a little groove to make sure it's not plated or filled. Check the ring that's connected to the ring on the charm; if that ring is soldered closed and not simply bent closed your chances of it being real gold go up. Anyone working with real gold wouldn't trust a piece of bent metal - they'd want a solid ring.