The Light of Meaning
The King in the Mists drops unidentified The Light of Meaning jewels. Identified, each grants one of 13 bonuses to passive skills in its radius, and that bonus sets the price. A Prohibited Library sample of 500 jewels found all 13 equally likely.
How the numbers work
Each modifier sells for its listing price times your resell percentage, or for your own price as entered. A modifier under your ignore threshold counts as 0. The average over all 13 modifiers, each 1 in 13, is what one identified jewel is worth. The equal odds come from a 500-jewel sample rather than datamined weights, so treat them as approximate. Prices are the listings of identified jewels grouped by their "Passive Skills in Radius also grant …" modifier, corrupted or not.