This is a Mother of Pearl beads necklace. It has round and oval shape Mother of Pearl beads and some glass pearls in the middle of the necklace. 

Mother of Pearl originates from the iridescent lining of shell from where the pearls are grown.  Mother of pearl is said to attract prosperity.  According to some healers Mother of pearl helps in controlling the high blood pressure, improves vision, cataracts, heals the wounds and dizziness too.