Victorian seed pearl and turquoise double shamrock brooch

Victorian seed pearl and turquoise double shamrock brooch in 15kt yellow gold. A ribbed bar brooch featuring a shamrock to top, each leaf set with seed pearls in grain settings, centred with a seed pearl in a rubover setting, set to bottom with a shamrock motif, each leaf set with round cabochon cut Persian turquoise in grain settings, further enhanced by two round cabochon cut turquoise in rubover settings and terminating at each end with a trefoil of seed pearls, fitted to the reverse with a secure hinged pin and C-scroll.