Looks like underwater coral to me….. the beautiful Graveyard Point 
Plume Agate was mined in Idaho & hand selected twice and chosen to be set in a hand stamped sterling silver frame. Completely unique and one of a kind…this piece is made to last for generations.  
Size 7 3/4
Graveyard Point Plume Agate is a special type of agate with feathery or plume like formations inside of it like feathers trapped in ice. 
Graveyard Point is a place on the Oregon Idaho border. 
Plume agate is formed in ancient hotsprings with microbes assisting in making the cool formations within the stone.