I was fighting the Jelly King today with a party of 4 and we killed the Jelly King. At the time, it seemed as though we all picked up 3 gems, but I checked my inventory after going down depth 18 and found I only gained 1 Jelly Gem. I asked the others I was playing with and they had all gained 3. Before fighting I had 18 and now I have 19. I believe I also lost some crowns as well, because I went through the entire tier 2 starting with ~400 crowns i ended up with ~3k crowns, and I usually pull a lot more from there.