Antique vintage Purple amethyst colored art glass bib necklace Art deco Egyptian revival Beautiful and unusual Victorian

Antique vintage Purple amethyst colored art glass bib necklace Art deco Egyptian revival? Beautiful and unusual. Approximately 15.75 inches long. The clasp is very beautiful and unique. This is gold tone I would imagine a sober Vermeil looking at the quality of the peace but I have not had it tested.