so, gil is not a matter
0-5 Copper Ring
-11 Brass Sheet (used in next)
-16 Brass Flowerpot
-20 Silver Ingot (used in next)
-27 Silver Hairpin
-33 Silver Chain
-38 Mythril Ingot
-41 (Optional) Gold Thread (with clothcrafting up)
-42 Mythril Earring
with little luck and knowledge you can get 1 skill up with 14+-6 synth
every synth is about 30 seconds, you can do 120 per hour if you really would have all material
ps: there is maybe a better way with recipe, its only an idea of mine
good luck