A creamy white graduated pearl necklace , 4.5 to 8 mm.

Generally round, lustrous and  not ridged. 

Some surface irregularity.

10mm diameter clasp. Set with a central bright blue round faceted stone 6.5 mm diameter. It tests in the topaz region . There is a hint of green in the stone so it could be a blue zircon

The clasp is marked 900 and tests for platinum. The white stones test as spinels. 

Length 17 inch. C 1920's. It is usable and pretty but there is a bit of stretching to the cord in places , due to age and it would benefit from restringing.