Yellow Phaseblade

Creation
You can craft a Yellow Phaseblade using 20 Meteorite Bars and 10 Topaz. This is the only item in the game known currently that uses a gemstone in its crafting recipe.

Origin
Phaseblades appear to be based on the Light Saber from the Star Wars franchise. It even goes so far as to include the humming sound effect and the emitted light when swung.

Trivia
It may be possible that the phaseblade will come in different colors, as the only one seen has been specified as yellow. The yellow phaseblade requires 10 topaz. It is speculated that it could use other gems, such as emeralds (green), sapphires (blue), amethysts (purple), rubies (red), and diamonds (white)

The phaseblade emits a small amount of light when swung.