User blog comment:Merlaa/Why "The Diamond of the Day"?/@comment-96.21.214.96-20160410030911

A lot of spoilers in this post.

It could refer to a poem about Merlin being trapped in a cave. He is trapped in the legends.

I have another theory. A diamond is bright and clear like safety, happiness and freedom. In this episode, it refers to the good things that will happen. Like the sacrifice Arthur is going to make by going to Camlann so that Morgana doesn't slaughter Camelot. Arthur is a source of hope, courage and a lot of good things in this world. So by going to Camlann, he will make sure that his people will be safe. Also, Merlin will reveal who he truly is to Arthur and Gwen (She'll figure out who he is). He will go from a simple servant to a friend, adviser and the magic of this world. Also, he's Morgana's doom. Morgana represents evil. She fights what she wants, which is not bad in itself, but it's her actions and the cruelty that she shows that is evil. Merlin will bring her to an end and freedom will reign.