Coeurl Eyeglasses ★★

Taken all the way down to base materials, one Coeurl Eyeglasses is 3 crafting steps deep and needs 4 intermediates — Clear Glass Lens ×2, Darksteel Ingot ×1, Darksteel Nugget ×2 and 1 other — which resolve to 5 distinct raw materials totalling 21 units, plus 19 crystals.

That bill outweighs 8,152 of the 13,602 recipes tracked here and 1,199 of the 2,216 Goldsmith ones, and 337 recipes nest deeper.

Only 2 of those crystals go into the final step; the other 17 are burned by the intermediates, so the real crystal cost is 10 Water Shard, 6 Fire Crystal, 2 Fire Cluster and 1 other kind.

The chain crosses three disciplines — Goldsmith to Lv 50, Blacksmith to Lv 50 and Alchemist to Lv 28 — so no single class can finish it unaided.

4 of the 5 raw materials come out of the ground, and one of them is time-gated: Darksteel Ore (1:00). That window comes round once per Eorzean day, every 70 real-world minutes.

Of the intermediates, Darksteel Nugget has the widest use: 121 recipes call for it, spanning seven of the eight crafting classes.