Warner is nice stuff. I also want to add that he made that beautiful day and night brooch which I could kick myself for selling (way to cheap). You can see a pic of it on pg. 6 of Marcia Brown's Unsigned Beauties. (His is signed, though)
Trying to identify pieces by findings like earring backs though is sometimes difficult with the exception of a few like Schreiner and even Austria used the same distinctive backing as Schreiner.
Since I haven't been in dabbling in jewels for over a year, it will take me time to reorganize things. I know I have my own pic of the day and night brooch as well as other Warner pieces.
I'll try to get a couple up (if I can find them LOL).