Art Nouveau Neiger Brothers Purple Crystal & Enamel Brass Filigree Necklace

An absolutely stunning antique brass filigree & stamping pressure set large rectangular faceted purple crystal stone 30mm x 15mm pressure set on a 45mm x 30mm filigree pendant on a figure 8/peanut brass chain 26” long with a spring ring clasp.  Has detailed cream white and purple polka dat enameling on each of the 4 corner areas.  Also has 4 bezel set round crystal rhinestones on each side.  In excellent condition, no damage or issues of note.