Making an item glow

Within my piece, I want to make a certain item glow to show it's significance that it has magical effects to it. The item in question is the pendant that can enable the user to stop time. After filming the initial shots I realised it wasn't clear that the pendant was the cause for time stopping so there needed to be some significant visual to emphasise that this is the item causing it. I've researched the best program to use to do this and it seemed that Adobe After Effects will work well. I do have some experience with this program as I used it to create the motion tracked titles in my AS piece There are also many tutorials online showing how to do nearly everything on After Effects including making things glow. Below is the tutorial that I plan on using when it comes to that stage in my editing.