Welcome Kelzor to the Darkstone Database,
I really do not think there is a Port of darkstone to Mac (Somebody may prove me wrong). I have never used a Mac so i do not know but i would say that your possibilities of playing are done to either a virtual machine running windows as darkstone doesn't require alot of processing to run or getting the PSX emulator for mac.
For a Virtual Machine:
For PSX Emulator: