I am no expert on Pearls so I don't know if these are South Sea Pearls or what kind they are but I can say

they are beautifully glossy white and uniform in shape.

They are hand knotted and they have a very fancy Large clasp which is marked 925 on the back.

There is one small White rhinestone missing. 

The rhinestones that are in the middle are a pretty dark blue.

The clasp is quite large and beautiful at a little over 1 1/2 inches across. Marked 925.

The Silver clasp has a Gold wash over it.

This Necklace measures a total of 17 inches long.

This is vintage and except for the one missing stone it is in very good condition and a Stunning Necklace with beautiful Pearls.