Fizban's Treasury of Dragons
Gem Dragonborn partake of the heritage of Gem Dragons, who claim to be heirs of Sardior, the Ruby Dragon. The colors and mysterious powers of Gem Dragons - amethyst, crystal, emerald, sapphire, and topaz - gleam in these dragonborn's scaled skin and course through their veins. Theirs are the wonders of the mind, the force of will, the brilliant light of insight, and the resounding echo of discovery - but also the desiccation of despair.
Gem ancestry: Gem Dragonborn trace their ancestry to a gem dragon, granting them a special magical affinity.
Psionic mind: Gem Dragonborn can telepathically speak to any creature they can see within 30 feet of themselves. They don’t need to share a language with the creature, but the creature must be able to understand at least one language.
Gem flight: Starting at 5th level, Gem Dragonborn can use a bonus action to manifest spectral wings on their body. These wings last for 1 minute. For the duration, they gain a flying speed equal to their walking speed and can hover. Once they use this trait, they can’t do so again until they finish a long rest.