The Gem Man is found here. Next to him is a Gem Crafting Machine. For the first part of the game, this is the only place gems can be crafted. Later on, a quest can be received from him, in which an Ultra Small Reactor must be obtained. It can only be found by upgrading all the levels to level 1 in the reconstruction of Colony 6. Once he is given the reactor, he will give the party the Mobile Furnace, which allows gems to be crafted at any time.