Public domain design using SuperDuo beads - basic instructions available free thanks to Marcia Balonis - http://www.baublesbybalonis.net/free_patterns/super_duo_earrings

I used MiniDuos & added a couple of extra rows plus a bead in the center. Using tight tension got a nice concave shape. I tried using silver seed beads to hide the thread, but the earring was flat and not as attractive. See image below for comparison.
MiniDuos
Transparent Colbalt
Transparent Ruby Red
White Opaque Luster

Fireline - 3#
Sterling 925 earwires.