The Season 5 episode, “The Shiny Trinket Maneuver” saw Sheldon gift the sparkly head topper to Amy as a way to apologize for not be excited when she tells him a paper of hers will make the cover of a prestigious scientific journal.
Sheldon loves comic books, and Amy is a fan of quilting and feeling like a princess.
While Amy and Sheldon have always been 100 percent committed to their work and scientific progress, they each have varying interests that keep them busy in their down time.
When she first realizes that he’s giving her jewelry, she chastises him for being shallow, but once Amy realizes that it’s a tiara, well, you can see what happened for yourself…