I think I’d value it enough to not jump in the water with it.
Two friends and I were at some dive steps (also a popular tubing site) getting ready to submerge, when a guy came over sheepishly to ask if we could look for his wedding ring there. His wife was a couple feet away looking ready to smack him. It was a mud bottom, and we took turns for about 25 minutes working a pattern in a 3-foot area.
We got lucky; I shook some muddy tree roots and felt a vibration fall through them. Plucking that ring from the mud felt precisely like a gollum moment. Worth it to see her face light up, although I’m sure the husband is still hearing about it. 
