This underwater scape is about 2.25 inches in size and captures glass barnacles on the ocean floor. The barnacle are made from murrine and placed on a base of blue colored glass. The sea creatures are surrounded by clear glass that is shaped into a perfect sphere using a graphite mold.
You can watch a video of a similar marble being made :
https://youtu.be/I8fcyZnDzRw?si=MyWf40qx6is1wddG