Well, this is not really an exploit ...but very helpful if u have a spoiler, or make one.
You need a lvl 6x spoiler, and u must bot around in frozen labrynith, in the region with Pronghorn Spirit's... These mobs have good drops and also let you spoil a good amount of varnish per mob, along with a almost 2% chance 2 spoil a scroll Enchant Armor B... If u bot in this region for a long time, u will probably stack up a LOT of EAB's ...
Then what u gotta do is simple ...craft black ore ring's, which are very easy to craft, & try to over enchant them. +10 is good but u can try to enchant further, these rings can be traded for valuable items or also be a replacement for S jewels. A ring of black ore+10 is a lot more powerful then a Tateossian ring +4, which most 76+ players prefer to wear.
This trick is useful in private server's with high rates like 5x, I havn't tried it on a low rate server. Also, a lot of ppl have a 6x spoiler.
Good Luck :D