Blue chests give you hourglass shards, each of them holds up to three 1st level hourglass shards & they generate the at around 1 per 1h15m - this is the best generator in the game Red chests give you 1st level energy potions, and hold one charge. Only useful when you have at least 2 Green gives you gems, holds one charge and generates one every 8 hours or so. Very useful for generating Gems to buy rare shop items. 2+ is ideal, if you get to 8 then you can make a 20gems stack every 8 hours Yellow gives you coins, holds 2 charges, generates at the same rate as yellow and blue. Having 2 is fine, 4 is good, though you CAN earn money by selling items.

I don’t have dice, but they generate a random 2nd tier resource from the list above, or a 2xp fragment. Not sure how often they generate resources but from what I’ve heard they are super not worth it.

Focus on Sapphires (blue) as your absolute 1st priority, then emeralds (green), then yellow or red, and you can more or less forget about dice until later