The Gem of Sindri

From The Inheritance Encyclopedia

The Gem of Sindri, or Az Sindriznarrvel, is a teardrop of glass that is said to be as large around as two dwarves, it's held up by four granite ribs that join together to form a pointed capstone. The teardrop is a larger version of the dwarves' flameless laterns, and during notable occasions or emergencies, it could be used to illuminate the entire valley with golden light.