Skarner Chromas

Honestly, these are too easy to come up with, and I can't believe they aren't a thing yet. Why does Skarner not have Chromas based on Gem Stones?

Amethyst: Base Skin Ruby/Garnet: Red Emerald/Peridot: Green Sapphire/Zircon: Blue Quartz/Opal/Pearl: White Amber: Orange