Obsidian is a naturally occurring volcanic glass created when felsic lava rapidly cools with minimal crystal growth. Obsidian is black or dark green; one may also find sections of Gold Obsidian or Silver Obsidian, which is when microscopic pockets of air become trapped during the cooling process.

We recommend that you do not roll your semi-precious stone dice on a surface harder than they are (i.e., glass or wood tables). We suggest you roll them in a dice tray to prevent possible chipping or breaking.