Vintage Three Line Pearl Necklace With Fancy Clasp

A necklace with three lines of cream cultured pearls and gold plated clasp adorned with a pearl.  The pearls are round to potato shaped and measure an average of approx. 5mm.  The strand lengths are staggered with the shortest strand measuring about 19 inches.  The clasp is marked SILVER but it is slightly magnetic.  I am unsure if this means that another metal was used in its construction.  These are most likely Chinese pearls.