Can I remove bluestone pavers embedded in mortar
You can always try.  You will need to break some of the grout away so you can see the base where the paver and the mortar meet.  Then using a floor chisel (3 inch wide blade cold chisel) set between the paver and the mortar, see if you can pop the paver up.  If the paver is not well bonded to the mortar, they will pop up.  If they are well bonded, they will just snap when the one side is getting lifted.