Iron is the most precious substance in the Three Lands—obtainable only from meteorites, or so it is believed—and for this reason is made into these Eye coins, a currency used exclusively among the Chosen. Such a coin represents, in its substance, in the colour of its rust and the smell it leaves on the fingers when handled—blood. A single coin has the value of a child from the flesh tithe. Mostly, these coins are used to pay the price for a Chosen bride, or for sexual access to a Chosen woman, in the hope of obtaining a Chosen child who will share the blood purity of its mother and who can be taken into the House of the purchaser.
Because these coins have been cast over many centuries, they vary considerably in design.