N. Sedlmayer & Co Austrian Crystal Necklace and Earrings

I have no clue to the background on this gorgeous set - only the name on the box it was stored in. If anyone has any idea, I would appreciate knowing more.

My mother recently passed away, and so I have this task of identifying special valuables that she had - much of ranges from gold to silver jewelry, and a lot of vintage costume as well. This also includes what she inherited from her mother as well. I believe this set to be from my Grandmother, Hanneliese Hoeft Thiel

My grandparents were from Berlin, Germany. They were also involved in the clock and jewelry business during World War II. I even have a photo of them standing in front of their shop. (I still have to find it)

Thank you, Juliana