Sunstone

Across the Elven Enclave, a distinct stone can be found in caves scattered across the island, growing in crystal-like patches. These stones are very similar to amber- they are orange-yellow, and semi-translucent. Sunstones, however, absorb and emit light. Folklore maintains that each stone contains within it a small gate into the Plane of Radiance.
Sunstones are “harvested”, cut, and crafted. Most commonly, in their finished forms, they are used as small, personal sources of light. Naturally, the stone acts as if it were a fist-sized rock enchanted by a Light spell. Other uses of sunstone are more ambitious, such as using it as a decorative element in architecture.