Need help identifying

I just bought this beautiful set of jewelry - clips earrings, bracelet, and necklace. All three are gold tone. The bracelet and earrings appear to have Aurora Borealis stones and the necklace appears to have clear swaroski. All three pieces are unmarked. The antique shop told me that the rectangle panels are real shell. I need some help...trying to figure out what time period this came from, which jewelry maker produced this, is this shell or mother of Pearl? I'm not an expert at this and having a difficult time with research. Any help is greatly appreciated!!!