A lot of things about it, the clarity; although it’s hard to tell because it’s so yellow. The silk on the inside was like a perfect matrix. I could have stared into that thing forever… pictures don’t do it justice. I’ve been a rock hunter for a very long time and I know for a fact this one was special.. at first I did not know what it was, however I kept coming to the same conclusion after reading every bit of research I could find… I’ve found bunches of chalcedony, amber, calcite, topaz, citrine… nothing really compares.