What do you mean by cost?
You prospect ore, cut gems/necks/rings, disenchant necks/rings, put enchants on scrolls, put gems & enchants on AH.
You can also Transmute to Primal Diamonds
If you have the professions on your characters then 0 gold, if you buy it from AH then it's all depending on the mats cost and it different from server to server.
You guys don't seem to understand. Let's say I'm prospecting ghost iron ore. Then I throw away all the rare gems. So I only have the green ones left. How many ghost iron ores would I have to prospect to get enough mats to make ex. 10 ornate rings? Can any1 do that math?
its random )