It is a type of mineraloid that can also appear in shades of blue, red, yellow, orange, or even green, giving you ample chances to style your Obsidian Jewelry. However, black is the most celebrated variety that can be found worldwide, such as in the United States, Mexico, Japan, Russia, Turkey, Armenia, Italy, Greece, and Hungary etc. It has a rating of 5 to 5.5 on the Mohs scale, making Black Obsidian rings an alluring fashion choice to flaunt on special occasions.