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 Chaos, but they may sometimes build ice palaces atop high, cold mountain peaks on the Material Plane.

Emerald Dragon
Emerald dragons are inquisitive about local history and customs. Their knowledge of particular areas is often beyond that of the best sage. These dragons are very paranoid and developing relationships with them is often difficult. When not on the Inner Planes they prefer to stay near partly inhabited areas on the Material Plane, but keep their presence unknown.

Sapphire Dragon
Sapphire dragons are territorial, especially towards other dragons in the Elemental Chaos and the parts of the Material Plane that they claim as their own. These dragons are anti-social towards all beings, but view the evil races of the Underdark to be their enemies.

Topaz Dragon
Topaz dragons are unfriendly and selfish. While not malevolent, their behavior makes dealing with them unpleasant and dangerous. They spend their time in the Elemental Chaos, but make brief trips in to the Material Plane into lairs on secluded beaches or caves below the waterline. Their lairs are completely dry.

Obsidian Dragon
An obsidian dragon has smooth black skin with razor edges where joints come together. When first hatched, their scales are gray, rough to touch, and well defined. As they get older, the scales darken, become smoother, and begin to blend together. Most obsidian dragons prefer to make their lairs around volcanoes or in one of the mountains of coal found on the Elemental Plane of Fire. Most great wyrms, though, make use of the genesis power to create their own demiplane.