These are a combination of czeck glass and silver beads. The darker beads are described as "fire polish black. " Bracelets are 7.5 - 8" around which fits mosts wrists.
Silver and grey/black czeck glass bracelet
Earrings and bracelets are typically a combination of beads made of gemstone, glass, wood, silver plate, nickel free metal, or plastic. French hook ear wire is typically silver plate or stainless steel. Often there are bracelets that match the earrings.