This is a fine example of circa 1900 Arts & Crafts Ruskin Art Pottery jewelry with a glazed mottled lapis blue ceramic pottery stone set in a hand hammered pewter setting folded around a brass back plate. This type of setting is typical of Ruskin brooches. The back has a simple pin stem with C clasp.
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" x 1.5". The center stone measures 17mm x 30mm.
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.