Baroque Pearl, Plique-a-Jour Enamel & Diamond Brooch (c. 1900)The stylized floral motif decorated with a baroque pearl of pale gray color with pastel overtones, and with 4 smaller pearls of aubergine, black and bronze hue, framed by scrolls of old European-cut diamonds and leaves of green plique-à-jour enamel, mounted in 18 karat gold, signed Marcus & Co.