Rainbow Obsidian Ring A

Rainnbow obsidian is a type of obsidian that has a rainbow-like appearance due to light reflecting off of mineral inclusions. It's a naturally occurring glass that's formed when lava cools quickly.  How it's formed  Lava from a volcanic eruption cools rapidly when it reaches the Earth's surface The rapid cooling prevents large mineral crystals from growing, resulting in a glassy structure Microscopic mineral inclusions, often magnetite nanoparticles, are present in the obsidian The way these inclusions are distributed in the obsidian creates the rainbow-like sheen These stones are 8mm and are set into a gold plated adjustable sterling silver ring.