Various types of Gems
Gems are a type of Treasure found in the Dead Ops Arcade mode of Call of Duty: Black Ops, Call of Duty: Black Ops III, Call of Duty: Black Ops Cold War and Call of Duty: Black Ops 7. Being the most valuable form of Treasure, they increase the player's score multiplier significantly more than other Treasure pickups.
In Dead Ops Arcade 3: Rise of the Mamaback, Gems come in varying sizes and grant more score and multiplier increase the bigger they are.