Made this hollow space pendant out of some scrap last night, but the opal exploded in the kiln overnight. Thought it was pretty cool though up until that. The space tube was a piece of scrap left over from the sherlock up above, and the opal was a big old opal that had a pretty bad crack in it already. I don't like to break polished opals, so I tried to use it with the crack, and was gonna give it to a friend who really liked the opal when he saw it. Also didn't have as much clear around the opal as I should have. The opal was pretty big to start, weighed in at like .4g if I remember correctly, and I didn't want to have a big marble on it either, so I just went ahead and took the risk. Was properly annealed as well. I guess both things combined were just too much stress for it to handle. Oh well, you win some, you lose some. No big deal since it was all scrap stuff, but still a bummer to see it not survive.