Caroline's Jewelry with a Past is offering an Arts and Crafts Era stickpin in low content silver and silver metal featuring a center agate surrounded by black enameling circa 1900 . The agate stone is gray and brown with green and black veining. The head of the stickpin is approximately 5/8" x 3/8" and the pin itself is 3" long overall.
The pin stem is white metal. The head of the stickpin is low content silver, ie 800 to 900/1000 and is probably German in design and origin.
Artsy Arts & Crafts Agate and Silver Stickpin c. 1900