So there has been a lot old threads saying that para gems should be tradeable in order to reduce scam attempts.
It seems that sts is not going to make them tradeable...so I came up with a pretty good idea
There should be an option that allows you to change your para gem from one item to another, so imagine you want to get a para gem to your arcane ring but obviously you won't trust an stranger with your ring.
So you give the para gem seller a legendary item worth 2k or maybe less, he para gems your item and then in the trade window you do the business transaction.
Once the legendary item is in your inventory you just socket the para gem from your legendary item to your arcane ring or any other high-worth item you don't want to give to a stranger!