Can anyone identify these 3 old vintage pieces of jewelry?

[hellofromny]

When were they made and what kind of stones or material are they? Where and when was the duck brooch made?

 

[stracci2000]

When were they made and what kind of stones or material are they? Where and when was the duck brooch made?

The pendant looks like 1970's modern style. It is 925 sterling silver, made in Israel. The "stone" is some kind of mosaic, likely glass chips in a clear glass base.

The second piece is older. If you could show the entire pin back with close-ups of the mechanism, I could give you a better answer.
It is 800 silver, made in Italy, and the stone is either turquoise or glass.
It could be 1900-1930s. I think this is the best of the three pieces you are showing.

This last one is marcasite, black onyx and the red is maybe carnelian.
It's not that old, 1940s-50's. I cant make out the stamp, but it probably says 925, and it's sterling. Theres no way to tell where this pin was made, but someone was selling it for $32.00 at one point.

This is all just my opinion.

 

[hellofromny]

Here are some closeups of the pin mechanism and the back. Any thoughts? Thanks.

 

[stracci2000]

Here are some closeups of the pin mechanism and the back. Any thoughts? Thanks.

Thanks for the photos. The style looks like Etruscan Revival.
Looking at the closure, I'm sticking with my original assessment of 1900-1930.
So it's pretty old. The 800 silver mark is also a clue to the age, as this type of silver is common in antique European pieces. The blue may be Czech glass, which was popular for jewelry making at the time.
It's very nice!