Aquamarine Block is one of the many Decoration Blocks added by the Soul Forest Dimension. It can also be called a Storage Block.
Crafting Recipe[]
Aswell as most of the Decoration Blocks this block is crafted with 9x Aquamarine Gems. After an Aquamarine Block is made, its content (the gems) can be easily re-obtained by simply placing the block in a crafting table.
Functions[]
a much more usefull function is the fact that you can easily store a lot of Amazonite Gems by turning them into blocks.