MEASUREMENTS: 2.5" diameter - 1/4" dome - total ength of turquoise drops: 1.5"
This is an odd brooch - definitely in the Arts and Crafts Movement style with a characteristic open "c" catch. However, there is no maker's mark, so the attribution is only my best guess. No matter what the exact age and country of origin, the design is gorgeous vintage.
Enjoy the brooch on a coat or heavy sweater,