Large Irish? Celtic silver pebbled agate brooch retailer

Large Celtic Irish? antique pebble dash agate silver brooch, this large amazing Celtic brooch was found by me here in Ireland on one of my treasure hunting trips. The stone is a pebble dashed agate stone in various colours of coral and dark orange, The stone itself measures 4.5 by 2 cm,The Celtic band around it finishes the brooch in a perfect manner.The silver marks are retailer on the edge of the mount and there are makers marks but hard to make out although one of the marks is a lion looking to the left.6 marks in total.
This is a real substantial brooch, that could look stunning on scarf, poncho, jacket, coat or even on a kilt..
I try to describe my jewellery the best I can, but please don't hesitate to ask any questions.
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