ok three files are important for the making of gems.
itemshape.csv in the script folder which will make it look how u want.
itemetc.csv where u make the item
itemsocket.csv
First in itemetc
make up some fake number
eg. 54679 Curse Gem then just change the status to value of whatever % u want
next go to itemsocket, take that number u created add it into this document
here you will pick what the gem can be socketed into.
and itemshape just take a copy of say a curse gem line and then just change the number to the one u made in itemetc.
Here is just a quick example
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