The heavens were a sacred place only able to be reached by skilled dragons with pure hearts or intentions. The heavens were rumored to be inhabited by two dragon types, but the only known type was light.

Light dragons, with their 'true light' ability, can heal any (non-congenital) illness or injury, as well as restore depleted gemstones. They have found, and collected--as well as restored many depleted--gemstones that they've then added to their hoards in the heavens.

To reach the heavens, regardless of having a pure heart/mind, takes a lot of skill, even for flighted dragons. Therefore, any dragon who successfully makes it there will be given a gemstone (which increases their natural powers) as well as have themselves--or a chosen loved one--healed as a reward.

Since gemstones are rare outside of the hoards in the heavens, and also because they were awarded to pure-hearted dragons who are skillful enough to reach the heavens, gemstones became a symbol of both strength and fairness for dragons who had them (giving those dragons with gems an 'elite' status).

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Everything changed when the heavens fell into ruin. Nobody knows why, but light dragons were forced from the heavens, and settled on the highest points of every land (mountaintops) as if to remain as close as possible to their former home.

But other dragons--those who were selfish or impure--now had easier access to reaching light dragons on the mountaintops, and demanded they be rewarded for it. Light dragons cannot innately tell if a dragon is pure-hearted, and became frustrated by their constant visitors, to the point where light types began to simply attack anyone who neared them, wishing to be left alone.

This instilled fear and confusion among the other dragon types. The once renowned healers were now violent and caused near-irreversible damage to other types like mountain dragons (who were forced to migrate from the newly-claimed summits to the mountain bases to avoid the light dragons' wrath).

As for the rumored second dragon type that used to inhabit the heavens, nobody knows who they were or what became of them--or even if they ever existed at all.

Nobody besides light types, that is. And getting near enough to ask a light dragon anything is a sure way to get killed.