Gem dragon

Gem Dragons are aloof, solitary, and self centered. They spend most of their time on the Inner Planes.

Amethyst Dragon
Amethyst dragons are wise and regal. They may be found serving as intermediaries between warring dragons, and even humanoid civilizations. An Amethyst dragon has lavender skin, and its scales that are shaped like naturally formed mineral crystals.

Crystal Dragon
Crystal dragons are the friendliest of the gem dragons. They are always curious, so they enthusiastically converse with willing visitors. Crystal dragons are fond of the Elemental Plane of Air, but they may sometimes build ice palaces atop high, cold mountain peaks on the Material Plane.