Technically, Obsidian is considered a rock and is most often cultivated from large pieces formed by volcanoes.
There isn’t a set price for this gemstone, as with other stones like diamonds. It’s also important to note that Obsidian in its natural form isn’t excessively expensive but looks luxurious.
With proper cutting and polishing practices, the value of the stone can increase. However, in most instances, obsidian won’t be as expensive as precious stones.