On their turn, a player must choose to perform only one of the following four actions.
1) Take 3 gem tokens of different colors.
2) Take 2 gem tokens of the same color. This action is only possible if there are at least 4 tokens of the chosen color left before taking them.
3) Reserve 1 Development Card and take 1 gold token (joker).
4) Purchase 1 face-up Development Card from the middle of the table or a previously reserved one from your hand.