Huge Museum Quality Landscape with woman on the bridge. Sardonyx shell in the Gold or Gold Filled Brooch Circa 1885

Huge Museum Quality Antique Sardonyx shell Landscape scene in Gold or Gold Filled Brooch/Pendant. No marks - which is common for that time. Measurements - 2 -1/3” by 2” (60 mm. by 50 mm.). Weight is 12 grams. Circa 1885. For this age - superior condition, but some cleaning will be helpful.