Where do we get hongmoon gems now?

[Lilyanthe]

So all the previous methods I knew for making gems is now long gone, or maybe I've forgotten how? I'm more or less almost done with the campaign. I'm in the middle of act 10 and I've received some hongmoon pentagonal gems. Since I'm just now coming back I can't solo some instances that drop a hongmoon gem box, but as we know drop rates are abysmal. 

 

Tl:dr where do I get more hongmoon gems?? 

[Uskdara]

Your best bet is to farm Moon Refuge and Ebon Realm for free Triangles and Squares respectively.  These are character bound, non transmutable versions though keep in mind.  But the only in game actual real hongmoon gems left now are the hepta box from Cold Storage/Heavens Mandate(fairly uncommon drop and both dungeons can only be done once a day if you have the orb of ascension).  Then you have a chance at getting a triangle now and then from daily dash.