What are the white stones in The Hobbit?

In The Hobbit, the white stones refer to the ancient elven gems known as the Elven-stones or Ithildin. They glow with a pure, silvery-white light when near orcs or in dark places, making them valuable tools for navigating dangerous environments. The dwarves of Thorin's company carry these white stones during their quest to the Lonely Mountain to help guide them safely through Mirkwood and other treacherous regions.