Tanzanite (HOWEE'S)

Tanzanites are Mechanical weapons makers. Our Tanzanite, however, joined the Crystal Gems and became a fighter.
Tanzanite once saw how Homeworld gems planned on poofing Ametrine (shattering her back on Homeworld) and wanted to stop it. She shot the Homeworld gems and gestured to her to flee. Ametrine fled and Tanzanite later caught up to her. Ametrine never trusted the Crystal Gems, they were her enemy after all, but she soon developed a special bond with Tanzanite, the only Crystal Gem she trusted. They fused and formed Onyx, a loyal Crystal Gem.

Tanzanite's weapons are Boomerang and Slingshot,