Gems can have greater strength, speed, and durability than humans. Your Strength, Dexterity, and Constitution have a bonus of +2 each.

You also are immune to being knocked unconscious and Magical Sleep, as you don't technically sleep.

Gems do not age or catch physical diseases, and thus do not die of natural causes like humans. However, they can still be killed if their gemstone is shattered, and they are susceptible to mental illness.

Gems can temporarily alter their physical forms. The more mass the altered form has relative to the Gem's normal form, the harder it is to maintain. They cannot change their color palette, though. You gain access to the spell Shapechange, but you can choose to change into items as well as animals while retaining your current modifiers. Creatures that see you must make an Insight check with against your Deception check to discern your legitimacy.

You can use Shapechange up to 5 times per long rest.

Gems can store and withdraw objects from their Gemstones. (Add a Bag of Holding to your inventory at the start of the campaign)

Gems can project light from their Gemstones to light up dark places. You can cast the spell Light at will without the need of components.

Most Gems can summon a tangible weapon from their gemstones. Gems can summon multiple weapons at once, but each non-fusion Gem has only one type of weapon that they can summon. You can select one weapon type to have mastery of. The weapon you have selected can be summoned back to you if you throw it or are disarmed by using a bonus action.

Gems have a wide range of abilities that are exclusive to certain Gem types or individual Gems.