What is a “mgem” ?
What purpose do emeralds have, and can I make profit with them other than selling them?
Should I keep mining in lvl1- lvl2 with a classic pickaxe?
What’s the best way to go from here? I have around a total worth of 15-20 World Locks now.
m gem is mining gem just like f gem they are fish gems
emeralds make items they dont make alot tough
What is a fish gem? I’m really new at this, I know nothing about these things 
Mgems = Mining gems (the amount of gems you get from ores)
Emeralds are a type of ore among with topaz, saphire, ruby and diamond
Yes, mining in level 1 and 2 with a classic is good, but you might need to do higher levels if you get a better pickaxe.
In your case, doing level 1 and 2 and selling level 3 keys is the best thing to do right now
As you can see here, you can sell gemstones for gems
fish gems are gems you can trade as you buy 2k gems worth og fish for a wl each and you sell them to fish monger for gems
Thanks for the help!
Thanks for helping ! 
And you can get more profit by selling huge and large gemstons separately from Mgems as a whole
