As such, only two well-known, canon Force users have wielded a purple saber. Mace Windu and Revan (not explicitly confirmed canon, but mentioned in TROS visual dictionary). So, because of the taxing requirements even just to find a purple crystal, purple lightsabers were extremely rare.
While blue, red, and green lightsaber crystals are the most common colors in the Star Wars universe, purple lightsabers are less often seen, and these exceedingly rare crystals were used by few duelists throughout history.
Behind the scenes
The lightsaber's amethyst color was chosen by the actor portraying Windu, Samuel L. Jackson, who wanted a purple lightsaber because he was "the second baddest Jedi in the universe" and so he could find himself among the many Jedi featured in the Battle of Geonosis scene.
The shading purple speaks to moral uncertainty, reconstruction, and recovery. Therefore, the individuals that used a purple lightsaber generally shared an affinity with both the Light and Dark sides of the Force.
Black is the rarest lightsaber color in the world of Star Wars. For a while, the only known black lightsaber was the Darksaber, forged a thousand years ago and owned by a Mandalorian Jedi. However, the High Republic era revealed that at least one more Jedi had a black lightsaber.
Rey's lightsaber was a yellow-bladed lightsaber that was constructed by the Jedi Rey Skywalker following the First Order-Resistance War.
According to a study conducted by Luke Willcocks, from the Centre for Interdisciplinary Science at the University of Leicester, purple lightsabers are the most powerful lightsaber overall and red lightsabers, wielded exclusively by the Sith, are the lowest on the power scale.
A crystal embodies the Jedi as the heart of the lightsaber, and pure kyber has no color until it's bonded to the Force user. This process likely resulted in Rey Skywalker's lightsaber being yellow.
The lightsaber's redesign was a byproduct of the bleeding process that damaged its kyber crystal, rendering it dangerously flawed and unstable, and necessitating the lateral vents were meant to prevent the cracked kyber crystal from overloading.
Yoda™ and Luke Skywalker™ classically have green lightsabers. Green implies a strong connection to the Light Side of the force. Anakin Skywalker™ and Obi-Wan Kenobi™ have blue lightsabers, due to their focus on fighting.
Tenel Ka Djo, the Princess of Hapes, had a tiara of rainbow gems worth the price of an entire solar system. She used some of the crystals in her second lightsaber, after her first one malfunctioned and led to the loss of her arm.
Arguably, some of the rarest types of Jedi were the so-called Iron Knights. These are members of the Shards species - crystals with a brain of their own.
The Gold Lightsaber, is one of the rarest Lightsabers to ever be seen. It is similar the Yellow Lightsaber because of its similar color shine of the blade, but the blade is a bit darker and as a result resembles more of a gold color. It represents a Jedi that is very strong in light side skills.
A single ghostfire crystal was worth 14,000 credits. When the crystals could be located, they could be used in the creation of lightsabers to produce a blade that was dim and translucent compared to the iridescent blades of other sabers, making it as difficult to detect as the crystals themselves.
Yes, pink lightsabers are extremely rare. A true pink has only ever been seen associated with Mara Jade and Mace Windu.
This single-bladed turquoise lightsaber was used by Tenel Ka Djo, a member of Luke Skywalker's New Jedi Order. It was built in 23 ABY on the fourth moon of Yavin Prime, and the second of two very similar weapons.
During this time, Revan wielded a single-bladed blue lightsaber with an alloy metal hilt as his primary saber. Some sources report that he also used a purple lightsaber to represent his independence from the dictates of the Jedi Council.
Only one person in canon wields a purple blade: the Jedi Council's Mace Windu.
Without a doubt, the most notable Jedi with a purple saber is Mace Windu, portrayed in the prequel trilogy by Samuel L. Jackson. Audiences first got a glimpse of the unusual blade in Episode II: Attack of the Clones, making Windu the coolest Jedi in one cinematic moment.
Leia's lightsaber was a blue-bladed lightsaber used by Princess Leia Organa during her time as a Jedi Padawan training under her brother Jedi Knight Luke Skywalker.
This can be seen in the novel starwars.wikia.com/wiki/Rogue_Planet. It's because of his mastery of sorsue (sorry for my bad spelling.) Well if you want the ACTUAL reason it because in the original 3 films the Green Light Sabre didn't exist until after Obi Wans death.
Luke Skywalker's lightsaber was changed from blue to green when they were filming because it was difficult to see. This became apparent during act one of Return of the Jedi when the battle on Jabba the Hutt's sail barge was shot during the day. The blue lightsaber blended in with the clear blue sky.