The fantasy realm of Gem Kobolds exists beneath deep underground in smaller groups in search for untapped sources of various veins of metal ore as usable materials and gems as nutrients, in more drastically situations they devour their own kin from rival groups and seldom seek out prey from the surface like humans, unless the dominant groups are capable to craft foreign designs from the surface like sun-resistant goggles and flintlock weaponry prove effective against other humanoids invading their caverns or man-made caves for their own means of exploitations in acquiring ore veins and gems.

Even more rare events that Gem Kobolds and Humans ever had more friendly diplomatic relationships or intimate interactions, however these rumors are never have been confirmed, as Gem Kobolds are solitary in nature and their life expectancies can go up one-and-half life longer than humans age on avoiding contact much as possible, should ever cross the line of inevitable then the Gem Kobolds won't stop at nothing whether it's either killing intruders, acquiring resources for survival, sate their ravenous appetite or resolve conflict and form alliance that benefits the Gem Kobolds in their interests and migrate further to the core.

The Gem Kobolds name their off-springs in combination of two types of gems like Sapphire and Emerald into Sapperald and sometimes three types like Ruby, Jet and Emerald into Rujeteld. Some Gem Kobolds have grown gems on their heads like some kind of antlers from Deer on the surface, larger and more impressive antlers indicate their age and when they die in natural causes then their bodies return buried and encrusted in the earth that at eventual occurance in many cycles later that new Gem Kobold groups will encounter this as source of reusable source of resources and nutrients.

(This is drawn in pencils and my attempt in drawing something as practice at Kobolds with flair and light vore theme)