Antique Silver and Agate Acottish Brooch

Gorgeous agate and silver brooch with original c clasp and pin. Back of agate shows a drill hole. Originally there would of been a piece of silver placed inside. This brooch does not come with that piece of silver. Though it may look like a crack in the agate at the clearest part, it is indeed not a crack but the colours of the agate itself. Silver is tested but unmarked. Overall great condition for age. 1910's