Lost: wedding band on a gold chain (near Montclair Elementary) (oakland piedmont / montclair)

On October 18th my necklace fell off - and I lost my deceased husband's wedding band. I also lost the gold chain and my simple gold wedding band. The only item I am desperate to find is my husband's wedding band. It is engraved with "NorthStar" on the inside. I don't know the size but he had pretty fat fingers. If you found it, have any tips on where to look, or a metal detector I may borrow, I'm extremely grateful.