Carbie tells the story of how a diamond is made through a tale of perseverance amid pressure. It focuses on Carbie, a shy but sweet piece of coal who eventually blossoms into a shining diamond after struggling in a difficult place.

Breegan created Carbie as a way to teach children how their struggles can produce their greatest accomplishments. Carbie's story highlights the importance of seeing glimmers of hope when we are on the brink of giving up in difficult times.

Carbie also serves as a passive lesson in science by telling the story of how a diamond is created. The book features talking points for parents to teach their children how carbon turns into a diamond in five easy-to-understand steps.