I'll go ahead and update you just based on the KOTOR lore i know
When a Jedi first construct their lightsaber they are drawn to a lightsaber crystal that resonates with their own Force Energy. The color of this crystal is usually similar to the color of the type of Jedi they are. Jedi Knights are Light Saber Specialists and gravitate to Blue, Jedi Consulars were masters of the Force and prefered using force powers over the Light saber, they gravitate to green.
After KOTOR most of the caverns where light saber crystals could be found had be stripped clean and new jedi had to Forge a crystal using their own force powers. Luke Skywalker did this.



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