Old cameo brooch date range and material?

[Red Dirt Relics]

Have any idea on how old and what material is this old cameo?

 

[Iggyks]

Milk glass?

 

[Red Dirt Relics]

Milk glass?

I thought so potentially

 

[Red Dirt Relics]

Because how would you hand do that I mean it's possible but would be super hard