You are purchasing the piece in the picture. I am selling these individually. They are 25x18mm amethyst cabochons. There are many different grades and colors of this Amethyst. I am not an expert on them. Amethyst can be very very expensive but these cabs have more of the "geo" feel. They are a bit rough with inclusions and striations of different shades of color. Colors range from super dark purple to areas of light lavender, sometimes grey or brown patches of color depending on the stone. These will work well in jewelry with a natural earthy feel.