Diamond in the Rough
Instructions: Order & Destruction
Kill "Boulder Chukkas" in Kadrin Valley on the hill above Duraz Dok around 31.8k 27k, until you get a Pocket Item "Consumed Rough Diamond". Equip it for the unlock.
Once the unlock triggered, you can claim the jewel buying it from the correct merchant in Library (Order) / Lyceum (Destruction).
Just east of them, you will find a Chaos Troll "Vragi the Brute" for Brutal Nose Ring unlock.