A geode is a cavity filled with crystals, so that they leave a hole inside the cavity, without filling it completely. They usually present a really aesthetic morphology. For this reason, many geodes have commercial value for collecting or decoration.
Reminder: These necklaces are made of natural materials; the color and pattern may vary from the one shown in the picture. due to lighting effects, display brightness/contrast settings, etc., the color tone of the picture and the actual object may be slightly different.