Random question - metal detector

Hi all,

I lost a small earring yesterday - potentially while forking over the lawn to prep it for turf. We are hoping to borrow or hire a metal detector to look for it, despite the unlikelihood of finding it, as it's important to me. I'm wondering if anyone has any experience of metal detectors and could provide any advice (what I'd need to find a small stud earring made of white gold, technique, etc).

Thanks very much,
mopeyjonah