1. A method comprising: receiving, by a computer system from a first remote device, a first order to trade at least one first luxury item from a first user, wherein the first order specifies that the at least one first luxury item has a plurality of respective first values for each characteristic of a set of characteristics defined by a standard luxury item profile, in which the first luxury item includes at least one diamond, and in which the standard luxury item profile includes at least one of a color, cut, and clarity; receiving, by the computer system from a second remote device, a second order to trade at least one second luxury item from a second user, wherein the second order specifies that the at least one second luxury item has a plurality of respective second values for each characteristic of a set of characteristics defined by the standard luxury item profile, in which the second values are different form the first values, in which the second luxury item includes at least one diamond; communicating, from the computer system, the first and second orders to at least one other user of a third remote device; receiving, by the computer system, a counter-side order to at least one of the first order and the second order from the at least one other user of the third remote device; and executing, by the computer system, a trade fulfilling at least one of the first order and the second order at a price that is identifiable based on at least one of the first order, the second order and the counter-side order.