The chocolate diamond was the prize for the raffle at the Swiss-Choco Watch Expo. Trina wanted it so much that she wanted Mina to cheat for her, so that she would get it. Meanwhile, Corey got Laney to cheat as we'll, so that Trina will eat it, and go into Diary Mode. Their plan worked. As soon as Trina took a single bite, she instantly went into Good Taste Love Diary Mode because it tasted so good.