Every Sapphire is expensive. It may be White Sapphire, Yellow Sapphire or Blue Sapphire. Therefore if you want a Sapphire you will have to spend a lot. Like I said earlier the Ratti would depend upon your weight. I only know of Amitabh Bachchan wearing two Neelam and no one else, so I guess it is possible.
You can also look at Neeli which is a subsitute of Blue Sapphire or Neelam.