"Nazar Boncuğu" (evil eye amulet). It is made of blue glass and is commonly used in Türkiye, Greece, Bulgaria, and other parts of the Mediterranean and Middle East.

The large blue eye is believed to:

Protect against the "evil eye" (negative energy or envy).

Bring good luck and protection.

Be hung in homes, cars, offices, or near doors, or given as a gift to newborns, newlyweds, or friends.

The smaller chain with several eye beads is decorative and reinforces the protective symbolism.