570 is an odd amount of sapphires to go missing, are you able to retrace your steps last night? it is possible you bought units or boosts without realizing it
I checked before making the post... and I rarely use sapphires that's why it's strange even for me...if there is no way yo get them back... no problem... next time I won't keep them for too long
I just asked on your behalf and was told you bought a fake army item last night. These are 600 sapphires each, which roughly lines up to what you said in the original post