No. They are usually made of whatever the body of the earring is made of.
Re pierce it, its all you can do.
yes it is.
yes they all do
how would anyone know if something is made of all gold or gold an silver
You should do all the same things you'd do if there wasn't a boy in your class with an earring, with the possible exception of admiring it when you have a free moment.
nothing, gold does not react at all.
All the 2000 to date dollar coins are NOT gold, they are made from brass, that's what gives them the gold color.
Each others backs. And that's not all they did on each others backs!
All elements, including gold, excepting hydrogen, helium, and lithium, were made inside stars using nuclear reactions.
the Olympic medals are made all from bronze silver and gold.
Yes, all elements are made of atoms.
Pure gold ores will be made of all gold although that is very rare. Mostly anything else would be minor impurities of other minerals