Whenever I do a lean-up, I always save these blue plastic bottles that I find. I hate that they're out polluting the world, but they do make an excellent art supply. I like to make flowers out of them, and use the leftover bits for things like these pretty little earrings.
 
Approximate Measurements:  6.6 x 4.6 mm
Ear wire Metal: hypoallergenic, nickel-free stainless steel post
Material: Blue "Clear Fruit" bottle plastic, plant based bio resin
Shape/Style: teardrop
Color(s): blue, silver