Pretty polished
Somewhat catchy music, sparkly sound effects, and graphics that don't punch you in the face - all good things about this game. The background imagery doesn't distract you, and the gameplay graphics themselves are nice and polished - the jewels, literally.
However, I have to say that it seems like there's way too much time given. You've got heaps of time to solve the puzzles, far more than you need, even taking your time... If you're going to have a timer, generally you keep it short to put pressure on and such. In my own opinion, I'd either shorten the timer, or remove it - there's just no.. sense of urgency stemming from it.
I did particularly like the fact that you can drag the mouse to swap pieces, rather than clicking on two separate pieces though; that feels very nice and intuitive!