The Diamonds

Usage
The Diamonds were solar powered devices. They were described as a blue stone set on a golden-colored metallic base. The device had several purposes: the stone itself was a solid solar panel, and the base held wires that could be attached to an appliance, giving it power.

to the solar energy sources found in a cave near the city of Ember. They are blue crystals with electrical wiring inside and a metal collar that holds a lightbulb, and are small enough that they are easy to carry, both by hand or by tying them to a belt. They turn on and off with a switch. They hold an eight hour charge if set in the sun for fifteen minutes.

History
The first, and apparently only diamond was found by the Troggs. They considered it to be a jewel, not knowing it's true purpose, and planned to sell it so that they could be rich. However, Doon Harrow stole it with the help of Scawgo, and smashed it on a rock while trying to save Lina Mayfleet from wolves. Doon and Lina later found out that there were another thousand diamonds in a secret room.

Diamonds can not only be used to make light, but also to power any electrical thing. Doon found this out, and powered a fan and a toaster. He also found out how they could be used to make a spark to start a fire, and how to hook them together to provide more power.

The discovery of these diamonds helped to rebuild civilization, finally providing humans with an electricity source. Humans were able to rebuild the old cities, but they no longer relied on fossil fuels of energy, instead using the sun as a new, clean energy source.