The cost of diamond engagement ring is based on color, clarity, carat weight, cut, certification and seller markup characteristics.
ideal cut diamond are the hardest of all gemstones; it is the simplest in composition; they are ordinary carbon. Colossal heat and pressure, over the eons, crystallized the diamond wedding ring into what they are today.
platinum wedding ring that is free from natural inclusions - trace minerals or other tiny characteristics - is the most sought after and there the most expensive.