You mean change Gold Ingot for Crystal Coins?
Paste it on Data/actions/other/changegold.lua
local coins = {
[ITEM_GOLD_COIN] = {
to = ITEM_PLATINUM_COIN, effect = TEXTCOLOR_YELLOW
},
[ITEM_PLATINUM_COIN] = {
from = ITEM_GOLD_COIN, to = ITEM_CRYSTAL_COIN, effect = TEXTCOLOR_LIGHTBLUE
}...