Joolies....Need info (date ,style...etc) on these 3 pieces (costume)

I was going through my cupboards and found a box of jewelry I had stashed away sometime ago. these 3 pieces caught my eye. The first is a metal necklace, I thought it might be silver, but there are no marks that I can see. The jump ring is marked Czechoslovakia in very very tiny letters.

the next 2 piece are pins (brooches) one is faux moonstone, again no marks, but the pictures do not do it justice. It is very colorful and eye catching.

the other with the square glass "stones " is marked CZECHO on the back. That's all I know.

 

is the faux moonstone - glass with jet glass beads? it's very pretty.

 

I believe it is. the black jet glass is faceted.

 

Black and moonstone may be Beaujewels they used that construction.

Little bib necklace is probably 1930s ish.