Ether your Intelligence or Charisma score increases by 2, and ether your Dexterity or Constitution score increases by 2.

Young dragonborn grow quickly. They walk hours after hatching, attain the size and development of a 10-year-old human child by the age of 3, and reach adulthood by 15. They live to be around 80.

Gem dragonborns are neutral with respect to good and evil, and are very charismatic and suave, masters of persuasion who delight in riddles.

Gem dragonborns are the same size as humans, standing under 6 foot and averaging almost 200 pounds. Your size is Medium.

Your base walking speed is 30 feet.

You have Draconic Ancestry. Choose one type of dragon from the Draconic Ancestry table. Your breath weapon and damage resistance are determined by the dragon type, as shown in the table below.

Draconic Ancestry

You can use your action to exhale destructive, but unique energy. Your draconic ancestry determines the size, shape, and damage type of the exhalation. When you use your breath weapon, each creature in the area of the exhalation must make a saving throw, the type of which is determined by your draconic ancestry. The DC for this saving throw equals 8 + your Constitution modifier + your proficiency bonus. A creature takes 2d6 damage on a failed save, and half as much damage on a successful one. The damage increases to 3d6 at 6th level, 4d6 at 11th level, and 5d6 at 16th level. After you use your breath weapon, you can’t use it again until you complete a short or long rest.

You have resistance to the damage type associated with your draconic ancestry.

You can speak telepathically with any creature you can see within 60 ft. or with any creature you have had spoken with telepathically in the past within 60ft. You don't need to share a language with the creature for it to understand your telepathic messages, but the creature must be able to understand at least one language or be telepathic itself. 

As a bonus action when you're speaking telepathically to a creature, you can give that creature the ability to speak telepathically to you until the start of your next turn. To use this ability the creature must be within 60 feet of you.

Once per short rest, as a reaction Gem Dragonborn's can temporary add their Intelligence modifier to your AC and gain resistance to psychic damage which lasts till the start of your next turn.

You can speak, read, and write Common and Draconic. Draconic is thought to be one of the oldest languages and is often used in the study of magic. The language sounds harsh to most other creatures and includes numerous hard consonants and sibilants.