Hello there,
I see a lot of people know a thing and dont want to tell everyone else so, here we go:
This gems is insane good to upgrade another gems, If u drop gem which is not for your class then u can use this to upgrade gems well! Take a look on photo:
An exp is broken. The amount exp has been decrease on KR and will be decrease in obt.
How much do they give in KR? They are useless if they dont give much exp because they cant be traded lol. Someone told me they cant be removed from a socket on KR either, so you cant sell them.
YOu could socket somethign they gave you and sell the item then again … only under friends.
But yeah, the exp amount was borken so or so.
Like scamming 3000 mats from newbies …for 10~30 silver ea.
Where it is worth atleast 100 ea.
True, I’m posting it right here because lot of people want to buy this gems for only ~200k each. And this is very low price compared to buying low materials to boost gem. So this maybe make them more valuable. 
It only worth about 300k-350k at most though. At 200k is equivalent to buying mat at around 65 each (which you can find frequently in market time to time).
