This was a tough challenge in precision soldering getting all the corners to solder without the previous joins overheating and falling apart. Couldn’t quite find a way to solder the last joint without damaging the stone. Tried heatproof gel but still couldn’t get it right. Then I accidentally dropped the stone and the corner snapped off, just enough to allow me to solder the last edge and then insert the stone and glue it back together. No one will ever know, unless they read this. Gave to mum for her birthday.