"Gem Shards" are magical items that first appear in "Frybo".
Pearl tried to explain to Steven that "These shards have a powerful partial consciousness that has been harnessed by Gems throughout history in order to create semi-sentient drone soldiers with the capacity to follow basic orders. Gems once created an army of these drones, but found their obedience waned as the shards overdeveloped inside their uniforms and turned on their commanders. You see, any shard inside any sort of container could become a monster!" . An example of this is when Frybo turned on Steven and Peedee Fryman, now the Gem Shards must be kept away from all clothing and other items to avoid other dangerous situations.