Isn't a miracle, a mystery how earth can gestate from a fossilized critter to a crystal all in that same uterus, give birth to an amethyst and make ammonites shine with opal fire...? Our planet is WONDROUS, from rivers to desert, forest and sand... even us... 
In this pair of earrings, fossil ray teeth and velvety calcite share the style with rustic but semi polished solid sterling. Post earrings, the only commercially made part used are the friction ear nuts on the back.
They measure total 50mm and 57mm approx.
I add to pictures a standard business card, a USA quarter coin and a ruler to add a visual of sizes, to be sure, you can out close to your ear a credit card, business card, etc. and that might help, if need extra pictures I can set them on the real size human mannequin ears to show you how it could look. (I honestly had not the chance/time to do it this time)