While Jinn was identified as a Jedi Guardian in the Order, he did not use the traditional blue focusing crystals that Guardians typically used in their sabers and instead utilized a set of green focusing crystals that were typically used in the sabers of Jedi Consulars. The hilt had a highly elaborate design with a scalloped handgrip.
Why this particular design then?
“Before we started shooting, George showed up with a huge gilded box. In it were lightsabers, and he asked me to pick one. I chose one, and he said, ‘That’s yours now.’ It was quite a moment. And I did get to keep it—it was mounted for me at the end of the film. I was thrilled.“―Liam Neeson