We are a commune of inquiring, skeptical, politically centrist, capitalist, anglophile, traditionalist New England Yankee humans, humanoids, and animals with many interests beyond and above politics. Each of us has had a high-school education (or GED), but all had ADD so didn't pay attention very well, especially the dogs. Each one of us does "try my best to be just like I am," and none of us enjoys working for others, including for Maggie, from whom we receive neither a nickel nor a dime. Freedom from nags, cranks, government, do-gooders, control-freaks and idiots is all that we ask for.
I looked up carnival glassd found http://carnivalglass.com/ which has tons of pages of pics. I did not see your example in the several pages I scrolled. However, the gentleman owner may be able to help identify your peices. Beautiful stuff.
Replacements in Greensboro, NC, has numerous experts and a pattern identification service. The owner has a museum of rare and antique pieces. Even though you don't have markings it might be worth a try:
My Significant Other deals in antique limoges porcelain and she has an enthusiastic interest in all glass/pottery/china.
She said she has never seen pieces like this before and would have to handle one to determine what it is made from. She says, "Glass sings, porcelain rings."
I do know this, since c.1880 imported china has been required to have the maker's mark and country of origin due to U.S. customs laws. However, china purchased by a person overseas and brought back probably would not have had a mark on them. And sometimes pieces would slip through the process unmarked.
American made glass/pottery etc was not required to have a maker's mark. It was very thoughtless ;-) of these manufacturers to not mark their pieces as they should have known they would be collectible in 75-100 yrs and the identification marks generally add to the value of the piece.
Like Up Late, I thought this might be Pickard, or perhaps Stangl or Stouffer, but I don't know.
Sorry, that's as far as my thinking on the subject takes me.
The shape of the cup seems familiar. I have boxes and boxes of my mothers tea cup collection. I f I had my stuff together I could go thro the hundreds of them and maybe have a better clue. What am I ever to do with all of them and the glassware, I have no idea.
Don't quote me on this, but both pieces look very similar to a tea set my wife inherited. It is German in manufacture and the rarity is variable as is the relative value. Newer pieces can be found cheap - $45/50 for single replacement pieces, but older pieces can fetch handsome prices depending on their age.