This is a fine example of circa 1900 Arts & Crafts Ruskin Art Pottery jewelry with a round glazed green ceramic pottery stone set in a hand hammered pewter setting with brass back plate. The back has a simple pin stem with C clasp. The 'stone' has lovely graduations of color, from pale green in the center to darker blue green around the perimeter. The stone is enhanced in the setting by a square cross form within the round brooch.
Ruskin Pottery was founded in 1898 by Edward R. Taylor and run by his son William in West Midlands of England. It was named after the writer artist John Ruskin. The pottery was famed for its innovative glazes. When it closed in 1935 they destroyed all of their glaze formula.
This particular brooch came from England. Most Ruskin ceramic stones were marked on the back but once placed in their closed back settings the mark is concealed. I am unwilling to open it up to prove a point, as I am quite confident that this is an authentic Ruskin piece.
The brooch measures 2.125" in diameter. The center stone measures 1" in diameter.
This is an excellent large example of Ruskin jewelry. If you are fond of Arts & Crafts period crafts then a piece like this is a must for your collection.