Astral Birch Necklace ★★

Taken all the way down to base materials, one Astral Birch Necklace is 3 crafting steps deep and needs 5 intermediates — Astral Birch Lumber ×2, Varnish ×1, Birch Lumber ×2 and 2 others — which resolve to 10 distinct raw materials totalling 28 units, plus 29 crystals.

That bill outweighs 9,936 of the 13,602 recipes tracked here and 1,019 of the 1,552 Carpenter ones, and 337 recipes nest deeper.

Only 4 of those crystals go into the final step; the other 25 are burned by the intermediates, so the real crystal cost is 10 Wind Crystal, 8 Water Shard, 4 Ice Cluster and 3 other kinds.

The chain crosses two disciplines — Carpenter to Lv 60 and Alchemist to Lv 60 — so no single class can finish it unaided.

5 of the 10 raw materials come out of the ground, and 2 of them are time-gated: Astral Moraine (0:00, 12:00) and Seventh Heaven (4:00, 16:00). The widest gap between consecutive opening times is 8 Eorzean hours, about 23 real-world minutes.

Of the intermediates, Varnish has the widest use: 114 recipes call for it, spanning four of the eight crafting classes.