Further info: I’m not sure what the equivalent value/exchange between these two values will be. As long as you want a reasonable amount of Heartscales for a IV Stone, I’ll be glad to make the offer.
5 Heart Scales for 5 IV Stones is a horrible deal. You should be asking for at least 3 Heart Scales per IV Stone (drop rate for Heart Scales is 11% while it is 3.5% for IV Stones)