Timeless jewels
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Pick a jewel and a socket (in the list or with a click on a gold ring on the tree). On the Seed tab enter a seed: the passives in radius show what they get, and the panel sums it up by outcome. On the Pick stats tab add the stats you want with weights: the panel finds the best seeds, and a click puts a seed on the tree.
Wheel zooms, drag moves; on a phone, use two fingers.
Tables from Path of Building (MIT) for 3.29, tree from GGG skilltree-export 3.29.1. Outcomes are in English, as in game. Decoding was checked against TimelessCalc on a sample of seeds, the Abyss jewels against PoB's own code (TimelessCalc lacks them; not checked in game); the trade search by seed was not tried live.
What the Timeless jewel calculator shows
A Timeless jewel in Path of Exile changes the passive skills around its socket on the tree. The seed on the jewel decides what each notable gets, and a keystone in the radius is replaced by the conqueror's keystone. Here you can check a seed you already have or find seeds for the stats you want. Six jewels work by radius: Glorious Vanity, Lethal Pride, Brutal Restraint, Militant Faith, Elegant Hubris and Heroic Tragedy. The five Abyss jewels (Historic Eye) work differently: Festering Vengeance, Extinguishing Grasp, Baleful Dominion and Destructive Aspiration conquer 44–59 passives, in an area of its own for each seed, and Reclaimed Malevolence conquers the path from the socket to the class start and one ascendancy notable.
On the Seed tab, pick a jewel and a socket, from the list or by clicking a gold ring on the tree, and enter the seed from the item. The nodes in the radius show what they get and the panel adds it up by outcome: the most frequent first, and hovering a row outlines its nodes. On the Pick stats tab, add the stats you want with a weight, a minimum or an exclusion: the panel finds the best seeds, and clicking one shows it on the tree. The Trade button opens a search for those seeds on the trade site. The page address holds your whole selection, so you can share it; favourites and seed history stay in this browser.
Results come from the Path of Building tables and GGG's tree, with their versions in the “?” hint next to the heading. For Reclaimed Malevolence the path here is the shortest one on the tree, while the game counts the path you actually took, so check the nodes. If a new tree is out, the page warns that results may be outdated.
See also: Cluster jewels · Bloodline ascendancies · Mandatory quests