Sugar is a baker who owns a little shop called Buns and Brews.
Pyrite is the most successful thief this side of Manehattan.
Crystal Quartz is an albino Pegasus who loves lazing in the clouds.
Black Jasper is a nurse at Canterlot Hospital who has a passion for gemology.
Blue Topaz is a Royal guard discharged for cowardice.
Sunstone is a junior geologist who finds a cave full of odd jewels.
When each of these ponies comes in contact with a strange gem, their lives will be changed forever.

Teen because fighting and occasional cursing. Crossover because gems.