Natural surface obsidian, 18k warm white gold, leather.

[trigger heading="Why Is This Unique?" text="Obsidian is a naturally occurring volcanic glass formed when molten lava cools so rapidly that atoms are unable to arrange themselves into a crystalline structure. The result is an amorphous material with a smooth uniform texture that breaks with a conchoidal fracture. Since prehistoric times, people have used this material to make jewelry and carvings as well as practical objects, like mirrors, knives or arrowheads. In fact, obsidian was so valued for these uses that ancient people mined, transported, and traded obsidian and obsidian objects over distances of up to a thousand miles."]