This stone was cut by my son using his own design. YAG is a man made crystal used in lasers. Most YAG that cutters get comes from rejected crystal that didn’t meet specs.
None of these pictures do it justice as it had almost as much fire as my wife’s engagement ring.
OMG that fire is insane!! Your son is really doing an amazing job, you must be so proud! I guess you could even say he’s… brilliant 🤣