I’m planning to attend Empire for the first time next year as part of a new League Guild (possibly as its Merchant Prince). While reading the Empire Wiki I noted that mana crystals are supposed to require phyreps but I have heard that this rule is often overlooked. My assumption is that while there are many sources of suitable crystals, the cost adds up if you want to buy as many as you might need (e.g. at least 7 if you have a mana site as your personal resource).
I have therefore acquired a quantity of small clear quartz crystals that I think would be suitable to sell as uncharged mana crystals for a few rings apiece (exact cost to be negotiated in person).
Hopefully this will help bring in a few crowns for my guild as well as increasing the total number of mana crystal physreps in game.
Slightly unhelpfully the grid in the photo is 21mm