Gemstone and glass adjustable Bracelet jewelry

Bracelet is in good condition and kept in a clean smoke free home. Not sure what the gemstone is but they are definitely gemstones. Black string with threaded black/gray/white beads alternating 2 gemstone beads and 2 faceted glass beads. Some of the photos look like the glass is cracked but it’s not. The bead is faceted. All beads feel smooth and appear to be in good condition. It’s actually excellent used condition. Bracelet is adjustable size 7 1/4 to 8 1/4