Level Botany!

Really you shouldn't craft unless you're in it for the fun of being a DoH as much as you're in it for the gil.

Neri's desynth guide is here on this forum.

I would add that at lvl 80 PvP was my favorite option. 1 victory equals 1 earring accessory, which is essentially a free chance at BC3 & desynth XP.

Alternatives would be i70+ dungeon drop jewelry, which has the RNG of the loot system to decide whether or not you'll even get the drop. Rose Gold Clasp require 9 peacock ore per ingot so that is an investment.

PvP jewelry is free tho