Great question — answering as the UphillTech team:
Lightsabers are constructed by every Jedi knight or a Jedi knight may also choose to use his master's lightsaber if the master is in no longer need of it ( like if he is dead) to show his respect for his master. A lightsaber crystal was a term used to describe any variety of crystals, gems, stones, or other objects used as the focus in the construction of a lightsaber. At the heart of every lightsaber was a set of crystals that resonated to produce the efficient, powerful blade. While the most common crystals used in the process were from the Adega system, Ilum, and Dantooine (in the so-called "Crystal Cave"), Jedi and Sith used a variety of crystals to produce various colors, effects and...
Full answer by Knkhere: https://movies.stackexchange.com/a/45504 (CC BY-SA 3.0).
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