Pop Jewels is a tile-matching game with a bubble-popping element that tasks a player with removing gemstones from the foreground of a fantasy scene that depicts a nighttime castle and a large crescent moon. A black cat with golden eyes that wears a witch's hat presents the player with different tasks during each level of play. The player's goal is to meet a target score at the top left corner of the game screen. They must also remove a certain number of gemstones per the area at the top right corner.
Unlike many popular bubble-popping games, Pop Jewels doesn't require the player to perform a match of three or more connected, matching tiles in rows and columns. Instead, the player can remove two or more connected, matching tiles displayed in rows, columns, squares or any other pattern. The only requirement is that the tiles share at least one side. If the player reaches the target score, completes their missions and removes all possible jewels, the game pops the last of the jewels automatically and rewards the player with additional points.
Pop Jewels offers the player boosters to make removing tiles easier. The player receives access to some boosters in different levels on the playfield, such as a rainbow jewel that removes all gemstones around it. They can also buy boosters, such as a hammer that smashes a single gemstone, with diamonds that they receive in gift boxes and daily rewards by watching advertisements.
The home screen features a leaderboard. The player can compare their rank to the ranks of other players around the world.