Beautiful !!
Vintage 
Necklace 
Two Strands 
White Round Beads that are larger at center & Unique Shaped Crystal Beads 
Several Round Open Filigree style balls in a brass tone metal 
 Crystal Beads are  Clear with an Aurora Borealis Color /Tone  Faceted Beads - Goldtone Metal accents and between each bead 

no markings or labels. 
Hook style clasp 
end to end the length is 23" includes the extra length with extender
Preowned Vintage  Good Condition  - Normal use and age wear 
See photos for details 
See my other vintage and antique jewelry 
thanks for looking