Real Monumental Art Cameo from the Beginning of XX century. Gold or GF twisted bezel

Real museum Quality Monumental Art Nouveau cameo from the beginning of XX century gold or gold filled brooch/pendant. One stress line - except that in perfect condition, especially for more than 100 y. o. Carnelian shell cameo. Total measurements 2-1/8” by 1-5/8”. Weight - 13.5 grams. Signed by the Artist