Unusual Wedgwood cameo necklace and brooch

I’ve googled extensively and not come up with a necklace of this construction.
Material is very glass like but more likely Lucite especially looking at the brooch clasp. Brooch is open fronted, necklace completely enclosed strung on linen type thread.
Is there a search word to use for these little pieces of what I presume is Wedgwood although they are a darker blue than I’ve seen before.
Brooch safety pin I believe is silver although I’ve not tested it yet. Does it’s construction tell me anything?
Thankyou

 

Unusual, I'll say that for them. I don't think they are actual Wedgwood. Is the necklace pendant definitely a jasper ware plaque held under a plastic cover? Verifying it is not reverse carved.

I was told once by someone who specialized in early plastic jewellery that when a pin is attached like this, using plastic where we usually see metal, it dates to WWII, when access to metals for non-war purposes was limited.

This is a general jewellery question more than a cameo one, so we'll see what others say.

 

First one is pate sur pate, by the look of it, so certainly not Wedgwood. I don't think the brooch is either.

In this instance, I think the pin housing being plastic is simply that it was easier to manufacture as a mould.

 

I'm nearly 100% sure not reverse carved although pendant is tricky as curved plastic.
Brooch is definitely not reverse carved.