This is very late (I was traveling for most of the day), but here was May 1′s Weapon Gem:
Gaol Blade — Value 189
Ranged 1, Melee 0
Forward-dash cont. fire +4, Item attack +3
It can be converted into a weapon for 6600 hearts, or ground up into 69 hearts.
In site news, I’m working on two new articles: one about styles of play, and another detailing the various powers you can obtain. Both should be up sometime soon.