Has anyone done any crazy math resting to try and figure out what the difference it? 10 Gemmed = 1 Iron Ingot + 100 Gem Frags + 2 Chunks of Coal 5 Heavy = 1 Meteoric Iron Ingot + 200 Gem Frags + 2 Chunks of Coal So simply overall they are 4 - 5 times more costly to make, simply based off of the resources needed to make them. However when I have used them there is zero change to % chance. Lava Fishing is Lava fishing? I know a few who have fished with nothing but Heavy and sure they have caught a few of the Rare ones, but while I am fishing the # of Ammonites vs Anomalocaris seems to appear the same? I know I have seen Fast Moving Lava and slower places but ??? We can guess all we want and I am working on test for the diff in the Skill itself and not recorded data for this yet? So basically if you have crunched and number what have you found.