How to find lost jewelry?

I work at a strawberry patch picking strawberries and a ring fell of my finger somewhere into the patch of strawberries I was picking at. I looked constantly and couldn't find it, then me and my boss looked again, he has this wire technique that he's used before and it said we were in the right area but I still couldn't find it. He ended up letting me off work early and said he'd look for it some more. And me and my mom will look for it again once she get's off work. Is there any ways or even simple ways that will help me find it, possibly without a metal detector? If I need to where can I rent metal detectors or how much do they cost? It's just a plain silver ring, and I'd love to find it as soon as possible.