After a meteorite filled with gemstones crashes into Equestria, Rarity uses the jewels for her latest fashion line. These gems soon become incredibly popular in all of Ponyville, until eventually whole Equestria gets in on the newest craze.

Yet something seems amiss with the gemstones. For instance, why are all the ponies obsessed over the shiny stones? And why do they seem to change more of Ponyville than just the villagers' attire?

It's up to the Cutie Mark Crusaders to figure out what's going on, and save Equestria from the threatening power of the jewels.