Because everyone wants a woman they can put up on a pedestal.
After the line art just washed some red brush strokes across her body and the crystal chunks in the background, then used Clip Studio Paint's colorize feature to spread it around in different shades. Then added some shading and sparkling highlights, and voila! Meet Ruby.
Also, due to the power of digital artwork. With a simple step, let me introduce you to her sisters:
Emerald!
Sapphire!
Amber!
Amethyst!
Turquoise!
and Hematite!
Here they all are in a single GIF:
And the timelapse video of the creation process which is not nearly as interesting as the GIF. There is a rapid-fire sequence of color changing at the very end which is just me adjusting the hue on the color layer and saving them as different image files: