Czech Antique Victorian geometric etched jet black mourning glass pin brooch

Antique Victorian Nouveau era Czech black mourning glass pin brooch. Beautiful hand made and hand finished black glass element with acid etched geometric detailing soldered on to a metal pin. 
 This is of museum quality and similar brooches can be found in The museum of glass and jewelry in Jablonec nad Nisou.
Origin: Czech 1900's
Size: 52 x 17mm 2" x 11/16"
Material: Metal base. Glass.
Condition: Excellent vintage condition. 
Quantity: 1
 
The idea of imitating precious jet started in the 19th century. Production of glass "jet" began in the Jablonec area in the 1860's. Originally, the pressed glass was bonded with resin on to a solid metal base. After 1877, Gebruder Feix patented the riveting of glass stones onto metal bases. However, the real revolution came in the 1880's when production began by tin-soldering glass stones with sealed metal tubes on to a wire base. The boom in black costume jewelry making in Czech continued until the turn of the century and by the 1910's had virtually gone out of fashion.