Originally Posted by Lancet
I'm assuming the "selected other quests" involve ones that include an optional rewards slot with a stack of 4 or 5 gems.

Not necessarily. Many quests have gems as an optional reward, but not all of those have malachite among the gemstone candidates.

I am in blood
Stepp'd in so far, that, should I wade no more,
Returning were as tedious as go o'er.