Alixcola,
I'm fond of these "rice krispie" pearls also! Your necklace appears to have very high luster and it's possible the clasp is 14k gold. Pearls like this were also produced in Lake Biwa, Japan, but there isn't any way to tell as they were co-mingled with the Chinese pearls.
Is the length comfortable for you? If you like it and wished it were longer, one strand could be used to lengthen the other strands.