It's the Circlet of Life (L)

At 10 allowances a run, this leve's 593,380 EXP works out to 59,338 EXP per allowance, which places it 6th of the 6 Lv 58 Goldsmith tradecraft leves that record EXP. The best of them, Embroiling Embroidery, returns 427,710 EXP for the same allowance, 621% more.

Across that rung the return runs from 59,338 EXP to 427,710 EXP per allowance — 6 distinct figures spanning 621%, so the wrong pick leaves 368,372 EXP of the allowance unspent.

On whether to wait: the best Lv 60 Goldsmith tradecraft leve returns 376,120 EXP per allowance, 12% less than the best on this rung, while the Lv 56 rung behind tops out at 379,930 EXP.

At Lv 58 this data holds 54 leves paying EXP across 2 categories: the 48 Tradecraft ones average 327,945 EXP per allowance, the 6 Fieldcraft ones 716,251 EXP, which puts this leve 82% below its own category's average.

Aurum Regis Circlet of Healing ×1 is a Lv 60 Goldsmith recipe, 3 steps deep through 6 intermediates, costing 37 units of raw material and 33 crystals.

Handing that in returns 16,037 EXP and 42 gil for every unit of raw material the order swallows, and the tree needs Alchemist, Goldsmith and Weaver.

The record carries a repeats value of 5. This site reads that as 5 further turn-ins on the same leve — an assumption, because the source data defines no meaning for the field — which would put the ceiling at 3,560,280 EXP and 9,360 gil for the 10 allowances it costs, or 356,028 EXP per allowance.