Janice — They could be
Alabaster by Stevens & Williams, later Royal Brierley, launched about 1914 (Dodsworth,
BGbtW), with the main production 1920s and '30s.
Alabaster was a jade type semi-translucent glass, each item always made in two colours, white with colours such as rose, blue, cinnamon, primrose (Jackson
C20 Factory Glass), and green.
I don't recognise the patterns, but then I have no information on what patterns S&W/RB may have made specifically for the American export market. Have you already eliminated Steuben, major manufacturers of a similar style in the US? Other British factories are unlikely in my opinion.
A worldwide Google search on "Stevens Williams Alabaster" will bring up plenty of illustrated examples, one or two apparently signed, which is always useful. I am rather sceptical about the authenticity of some of the more fanciful colour names you will find.
Bernard C.
