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This mark with three-peaked Mount Fuji and something (a river?) in the foreground is quite similar to that of Fukagawa, a prolific Japanese porcelain manufacturer still in business today.
Alongside the best known Japanese damascene makers, there were any number of smaller firms, and with only a pictorial logo, this mark is quite difficult to identify. All I can surmise is that it must be a maker located somewhere in the vicinity of Fuji, which would include Tokyo and Yokohama.
I would recommend posting to a jewelry site if you haven't already done so.