These are a little bigger than your basic stud earring gems, more than a pencil eraser size.  They show up nicely.  They're ovals, so if you have really saggy pierce holes, or were pierced really low, they might hang off the lobe a bit.  Mine were done pretty low, but the earring fits cleanly on my lobe.

The color I got was a tad less dark than pictured, which I actually liked, as I prefer the lighter green with a hint of yellow.  It's a fresh neutral.

These go nicely with Gem Avenue's Sterling Silver Band Oval Cut Peridot Cubic Zirconia Ring Size 5 to 10.  Their ring's gem  is a little more gold and lighter then the earring peridot, but unless your hand is right next to your ear, they'll work fine together.