Start out with two flattened circles of the same size in red and white. Make sure to do the white one first so the red dye doesn't blend over from your fingers.
Cut each in half.
And re-assemble them.
Then cut thin slices of black clay and lay them over the seam.
Make another flattened white circle about 1/4 the size of the one you made before. Also, roll out some black clay very very thinly.
Wrap the black clay around your white circle.
That's right, pokeballs.
Then, y'know, bake clay according to the package instructions, glaze if desired, and glue to earring posts.