Brilliant Jewels is a match-three with two ways to play: against the clock, or against a move limit. Matching three jewels clears them; matching four or more creates special tiles that clear rows, columns or areas, and combining two specials produces the big board-clearing effects.
The move-limited mode is the more interesting one, because every swap has to earn its place rather than just being fast.
Match four or more jewels at once. Four in a row makes a line-clearing tile; five or an L-shape makes something more powerful, and combining two specials clears a large area.
Limited moves, generally — the timer rewards speed, but a move limit punishes every wasted swap.
Yes — swipe to swap. Nothing to install.