Price listed is for sixteen flat back stones. These are approximately 10mm lt gray stones. These are lightly faceted with flat gray foil backs. These stones came in with a dusting of powder which I assume is to lesson any scratching during shipping. The manufacturer referred to these as 10mm. However, they measure out at about 9.67mm. These are a very light black diamond. THE COLOR MAY VARY FROM ONE BATCH TO THE NEXT.