The classroom gems explain how gems are made. Subscribe to the Cartoon Network UK YouTube channel: https://www.youtube.com/subscription_center?add_user=cartoonnetworkuk Visit the Cartoon Network UK website: http://www.cartoonnetwork.co.uk Welcome to the official Cartoon Network UK YouTube channel, the place where you can watch funny videos, clips with theme tunes and songs and interactive game plays from Adventure Time, The Amazing World of Gumball, Regular Show, Ben 10, We Bare Bears, Uncle Grandpa, Steven Universe, Clarence, Teen Titans Go!, Ninjago and many more. Get ready to laugh out loud and join us by subscribing to the channel!