The Diamond of the Day, Part 1

Season 5, Ep 12, Aired 12/22/12
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  • Episode Description
  • Morgana prepares for war gathering a great horde high in the mountains. But she is not alone: a revenge thirsty Mordred stands at her side. The terrifying weight of his destiny rests on Merlin's shoulders heavier than ever before as the ancient prophecies unfold with uneasy accuracy. But before he can save Camelot, he must save himself for Morgana wishes to destroy Emrys along with his beloved kingdom.

  • Cast & Crew
  • Colin Morgan


  • Angel Coulby

    Gwen (Guinevere)

  • Bradley James (II)

    Arthur Pendragon

  • Katie McGrath


  • Richard Wilson (III)


  • Fan Reviews (10)
  • Great episode but...

    By rkoenn, Jun 01, 2013

  • Do love

    By _CNK80Q3_, Jan 12, 2013

  • Find the season 5 soundtack

    By Novazuzuka, Dec 28, 2012

  • Finally a reveal!

    By SkaRtsiS, Dec 24, 2012

  • HELP!!!

    By panagiota101, Dec 24, 2012

  • Trivia & Quotes
  • Quotes (37)

    • Ari: I will not humiliate myself before you.
      Morgana: You will if you want to see your family alive.

    • Mordred: (About Ari) He was a loyal soldier. In robbing him of his magic, you've lost yourself a powerful ally.
      Morgana: Perhaps. But we now know the war can be won. For Arthur is nothing without Emrys and Emrys is nothing without magic.

    • (Arthur and Merlin are playing dice)
      Arthur: Feel free to retire at any time.
      Merlin: Likewise.
      Arthur: It's no disgrace for a servant to lose to his King.
      Merlin: Or a King to his servant.

    • (Arthur and Merlin are playing dice)
      Arthur: You put me off!
      Merlin: What are you talking about?
      Arthur: You just coughed!
      Merlin: I was clearing my throat!
      Arthur: You just coughed deliberately.
      Merlin: Ah... I knew you'd discover my secret in the end. There is just no fooling you, my lord.

    • Merlin: (After Melrin is attacked by the Gean Canach) What happened? What was that thing?
      Gaius: Morgana's work. That's for sure. Mordred would have told her of your powers by now, Merlin. It was only a matter of time before she struck out. We can only be grateful that she failed.

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    Notes (7)

    • Also Known As:
      Poland: Diament Dnia (część 1).
      Portugal: O Diamante do Dia Part 1.

    • It took over 15 minutes for Colin Morgan to roll the two sixes on the pair of dice.

    • The Great Dragon does not appear in this episode, but John Hurt is credited for the voice-over at the beginning of it.

    • This is the seventh time that a two parter episode is featured in Merlin (the first time being episode 2x05 Beauty and the Beast – Part One and episode 2x06 Beauty and the Beast – Part Two, the second being episode 3x01 The Tears Of Uther Pendragon Part 1 and episode 3x02 The Tears Of Uther Pendragon Part 2, the third time being episode 3x12 The Coming Of Arthur, Part 1 and episode 3x13 The Coming Of Arthur, Part 2 ,the fourth time being episode 4x01 The Darkest Hour, Part 1 and 4x02 The Darkest Hour, Part 2, the fifth time being episode 4x12 The Sword In The Stone Part 1 and episode 4x13 The Sword In The Stone Part 2 and the sixth time being episode 5x01 Arthur's Bane Part 1 and episode 5x02 Arthur's Bane Part 2.
      Series 5 is the third one to begin and end with a two parter episode after series 3 and 4.

    • Broadcasts:
      22 December 2012 at 19:55-20:40 on BBC One.
      23 December 2012 at 19:50-20:35 on BBC Three.

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    Trivia (11)

    • This episode marks the third time in which the Dochraid can be seen after 4x09 Lancelot Du Lac and 5x09 With All My Heart.
      It also marks the return of Balinor who was first seen in 2x13 The Last Dragonlord.

    • Balinor refers to Merlin as a 'son of the earth, the sea, the sky'. The Dochraid defined herself as 'a creature of the earth' in episode 5x09 With All My Heart.

    • This episode marks the second time in which the Crystal Cave is visited after 3x05 The Crystal Cave.

    • Goof: Gaius wears glasses, even though they weren't commonly used until the 13th century.

    • Scenes from episodes 1x04 The Poisoned Chalice, 1x07 The Gates Of Avalon, 1x09 Excalibur, 1x11 The Labyrinth Of Gedref, 1x12 To Kill The King, 2x08 The Sins Of The Father, 2x13 The Last Dragonlord, 3x01 The Tears Of Uther Pendragon Part 1, 3x02 The Tears Of Uther Pendragon Part 2, 3x05 The Crystal Cave, 3x08 The Eye Of The Phoenix and 3x13 The Coming Of Arthur Part 2 can be seen during this episode.

    Show More Trivia
  • Add a Comment
    In reply to :
    • johnnyhuffman41 Dec 22, 2012

      Watch Episode Fullvids here->http://tinyurl .com/Merlins05e12finale
      Watch Episode Fullvids here->http://tinyurl .com/Merlins05e12finale
      (Remove the Space in The URL)
      Diamond of the Day, to give freshness to all of us. Previously, maybe we need to inform a complete and accurate information to you, so you'll get the right information about this good news. Merlin Season 5 Episode 12 will be broadcast by BBC on 12/22/2012.

    • el_batuai Dec 19, 2012

      oh i cant wait for the next episode!!

    • melkepper Dec 17, 2012

      I was surprised that Morgana was stupid enough not to know right away seeing Merlin was always standing in her way! also Arthur surely must have noticed that strange things happen when Merlin was near. I don't think he will be surprised to know about Merlin;s magic.

    • EvaEvka95 Dec 17, 2012

      Well, could be or could be not surprised,But that is just how TV is. the audience sees the obvious , yet few episodes must pass till the character itself does. is pretty funny when i think about it.

    • EvaEvka95 Dec 16, 2012

      I think it could be that in the end Emrys will win this fight with Arthur, the only thing i wonder about, is will Emrys reveal his magic to Arthur , and if he does, how will Arthur respond to it.

    • berfinbozcan Dec 17, 2012

      Yeah, i hope Arthur will find out about Merlin's magic.

    • markyoung5439 Dec 16, 2012

      cant believe morgana now knows who emrys realy is. could it be the end for Merlin?

    • tatjanakovac5 Dec 17, 2012

      Don`t forget the great DRAGON... Without him there is no Merlin!

    • EvaEvka95 Dec 16, 2012

      Hard to believe that Morgana could completely destroy Merlin, Although we do know from the 12th episode 'trailer' that he somehow loses his magic.

    • See More Comments (6)