Im interested in buying a real earing and white gold. And I'm looking for onejust slightly smaller then a dime.I was wondering if the bigger the earing is the higher you would have to pay for it?or do they charge by carot weight.like 1 cariot,half a carot.I want a real one earing.even if it is a .25 carot.the only thing is I want a big one in white gold.what proce could I be looking at.any store suggestings I could check out?