Dzi bead: a type of stone bead of uncertain origin worn as part of a necklace and sometimes as a bracelet. In several Asian cultures, including that of Tibet, the bead is considered to provide positive spiritual benefit. These beads are generally prized as protective amulets and are sometimes ground up into a powder to be used in traditional Tibetan medicine.
These four beads are extremely rare. They have been identified by an expert in the field as being ancient beads from Mitanni. This was a state in Northern Syria dating from 1500BC to 1300BC so this is among the earliest glass. Trade routes passed through the area and many items passed through. Necklaces were popular during that period with glass, gems and stones. http://www.oldbeads.com
African Trade Beads | 7 strands of Antique Venetian beads ~ dated from 1800 onwards; including from the outside working in, king beads, Venetian disks, chevron beads and then four strands of mixed fancy beads.