Signets of learning are both an extremely useful item and a form of currency. The typical way to farm them is to destroy SU and sets or do nihi runs. But what if I told you that you could turn Arcane crystals into them? Simply use the arcane crystals to turn arrows/bolts/jewelry unique and cube the result with a Catalyst of learning. This is in fact in the documentation which is why I posted this here (I had over looked this many a times and wanted to share my "discovery")
On the subject of unique jewelry, using the roll as unique recipe is it possible to roll a sacred or secret ring (e.g. empyrean glory or a cotw)?
Is it possible to reroll a TU item like you can with an SU and an enchanting crystal?
How much MF is required to have consistent and often unique drops?