Featured Help identifying stone on nouveau style necklace

Hi! I'm new to this forum. I recently inherited some vintage jewelry from my aunt and I'm trying to figure out what some stones are and what period they are from.
Any help is greatly appreciated.
The pendant is stamped E.I.F & Co. The stones look to have a milky tone to . The neclace is unmarked, but has an old style spring clasp. Unsure if the green is a stone or glass. It is cool to the touch.

 

Welcome to the forums! Lovely pieces. E. I.F. & Co. is the E.I. Franklin & Company

"EIF Co.
turn-of-the-19th century jewelry maker
The Century
E.I. Franklin & Co.
N. Elm St., Attleboro, Mass.
Source: Keystone 1934, page 8"

In the middle of the 2nd row:
http://www.morninggloryantiques.com/JewelChatMarks2.html

Sorry, can't help you on the stones. Others will be along shortly who will ptobably know.

--- Susan

 

Looks like peking glass and satin glass from here.

 

Top looks like it could just be enamel.

 

Yes, the top one enamel, the bottom Art Deco one satin glass and what looks like marcasites around the edges.

 

Wow, thanks for your input! I believe the lavaliere is stained glass! Ha! Never even occurred to me.
Using the glass reference I believe the necklace is peking Czech glass. Very similar to other pieces I saw by Max Neiger.