Emerald was an archaeological student that accidentally uncovered a hidden gemstone in Mayan ruins that gave her ungodly strength and stamina and making her skin as tough as diamond. (Looks like She-Hulk, origin story like Juggernaut).
Emerald was a combatant in the Superheroine Battle Arena, a no longer updated superheroine wrestling site. Her stats can be found HERE
Here is the time lapse video of my QuickPaint process:
And here is the B&W line art version:
And thanks to the magic of Clip Studio Paint Pro, by monkeying around with the Hue/Saturation/Lighting bars, I can quickly make images for her two sisters (they never existed until this moment)...
RUBY!
..and SAPPHIRE!