Leecher here, trying to contribute. Sorry if repost, close then pls.
Probably common knowledge, but useful.
Gems sell mostly around 20g or less on my server, so it isnt a huge profit to sell the gems. But while JC dailies the Prices for the Daily-Gem rise up to 40-50g so its more than double the Profit.
Example:
Jasper sell for 15-20g, today you need them for the JC-Daily and sell for 40-50g = Profit!
So spare youre gems for Dailies and buy low gems on non-Dailies and sell em high on dailies