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
   },
   [iTEM_CRYSTAL_COIN] = {
       from = ITEM_PLATINUM_COIN, effect = TEXTCOLOR_TEAL
   }
}

function onUse(cid, item, fromPosition, itemEx, toPosition)
   if(getPlayerFlagValue(cid, PLAYERFLAG_CANNOTPICKUPITEM)) then
       return false
   end

   local coin = coins[item.itemid]
   if(not coin) then
       return false
   end

   if(coin.to ~= nil and item.type == ITEMCOUNT_MAX) then
     if not doPlayerAddItem(cid, coin.to, 1, false) then
     return doPlayerSendCancel(cid, "You don't have enough space in your backpack.")
     end
       doChangeTypeItem(item.uid, item.type - item.type)
       doSendAnimatedText(fromPosition, "$$$", coins[coin.to].effect)
   elseif(coin.from ~= nil) then
     if not doPlayerAddItem(cid, coin.from, ITEMCOUNT_MAX, false) then
     return doPlayerSendCancel(cid, "You don't have enough space in your backpack.")
     end
       doChangeTypeItem(item.uid, item.type - 1)
       doSendAnimatedText(fromPosition, "$$$", coins[coin.from].effect)
   end
   return true
end