Jen these are different sorts of inclusions found in a diamond. If you do a search for each one you will find lots of info which will help you learn about them. I think this is the best approach as each inclusion is an interesting topic, feathers particulary and the search should give you all the info you need.
You are welcome! Inclusions can be a complex and very interesting subject and there are pages written about them in old posts, better than we can answer in a single thread really, so I wish you happy reading!