The Amber Gem will grant fire resistance when placed in the offhand slot.
Effect Gems is a realativly simple datapack that adds a new mob called the Gem Zombie. The Gem Zombie, upon death, drops one of twelve different gems. These gems will award the player with powerful effects when they are equipped in the offhand slot.
There are a total of twelve different gems that can be droppped by the Gem Zombie. Each gem will grant a different effect when it is placed in the offhand slot.
The Amber Gem will grant fire resistance when placed in the offhand slot.
The Amethyst Gem will grant strength then placed in the offhand slot.
The Aquamarine Gem will grant speed when placed in the offhand slot.
The Aventurine Gem will grant night vision when placed in the offhand slot.
The Cordierite Gem will grant slow falling when placed in the offhand slot.
The Diopside Gem will grant jump boost when placed in the offhand slot.
The Onyx Gem will grant resistance when placed in the offhand slot.
The Pearl will grant dolphin's grace when placed in the offhand slot.
The Quartz Gem will grant glowing when placed in the offhand slot.
The Ruby Gem will grant regeneration when placed in the offhand slot.
The Sapphire Gem will grant water breathing when placed in the offhand slot.
The Topaz Gem will grant haste when placed in the offhand slot.
Effect gems has commands that can be used to give items added by this datapack. There is also a command to summon the Gem Zombie.
You can give yourself items added by this datapack by running the command:
/function give:[ITEM_NAME]
You can spawn in the Gem Zombie by running the command:
/function summon:gem_zombie