A short, one handed dagger that was the cause of much fan mystery in season 1 of Voltron: Legendary Defender, which gained new importance in season 2. Measures 16 1/8" overall, with a 9.5" blade.
Blade uses inset tabs to attach to the hilt, and the gem snug fits inside. Depending on print settings, the gem inlay may be too snug to fit inside the gem body. I was able to get mine to work by warming the parts in a toaster oven and using a ratcheting clamp to force them together, but I included a unified version of the gem as an option as well.
Parts are the same for both halves, so just print two copies of your chosen parts (optionally mirroring the gem if you want to do it translucent and have that match up).