Black Star Earrings of Gathering

Taken all the way down to base materials, one Black Star Earrings of Gathering is 3 crafting steps deep and needs 4 intermediates — Black Star ×1, Ra'Kaznar Ingot ×1, Thunderyards Silk ×1 and 1 other — which resolve to 4 distinct raw materials totalling 18 units, plus 48 crystals.

That bill outweighs 7,380 of the 13,602 recipes tracked here and 1,038 of the 2,216 Goldsmith ones, and 337 recipes nest deeper.

Only 16 of those crystals go into the final step; the other 32 are burned by the intermediates, so the real crystal cost is 16 Fire Crystal, 16 Wind Crystal, 8 Lightning Crystal and 1 other kind.

The chain crosses four disciplines — Goldsmith to Lv 100, Blacksmith to Lv 98, Weaver to Lv 98 and Alchemist to Lv 95 — so no single class can finish it unaided.

All 4 raw materials are gathered, and not one of their spots is timed, so nothing in the tree waits on the Eorzean clock.

Of the intermediates, Ra'Kaznar Ingot has the widest use: 166 recipes call for it, spanning seven of the eight crafting classes.