Bad to the Bone

One allowance here buys 24,790 EXP, the best on the Lv 15 Goldsmith tradecraft rung — matched exactly by 1 other leve of the 6 there, with the rest trailing at 18,910 EXP or less.

Across that rung the return runs from 10,100 EXP to 24,790 EXP per allowance — 4 distinct figures spanning 145%, so the wrong pick leaves 14,690 EXP of the allowance unspent.

On whether to wait: the best Lv 20 Goldsmith tradecraft leve returns 21,600 EXP per allowance, 13% less than the best on this rung, while the Lv 10 rung behind tops out at 9,990 EXP.

At Lv 15 this data holds 52 leves paying EXP across 2 categories: the 48 Tradecraft ones average 16,554 EXP per allowance, the 4 Fieldcraft ones 78,432 EXP, which puts this leve 50% above its own category's average.

Brass Circlet (Sunstone) ×1 is a Lv 18 Goldsmith recipe, 2 steps deep through 2 intermediates, costing 10 units of raw material and 6 crystals.

Handing that in returns 2,479 EXP and 53 gil for every unit of raw material the order swallows.