llxxll, you don't need to buy them. i buy them online for my personal use but for my clothes my designer guy gets his own.
they are in quite common use in Pakistan now. the only thing is that they are pricey so inclusion of them in kaam will make the work automatically more expensive.
you just need to have a proper idea of the real thing and the fakes. so if you ask a kaam wala or boutique to use them, you need to be able to tell if they actually have. so it's always a good idea to get them to make up a sample or check their previous/current work and make sure swarovski's have been used.
where online do you get them?
does someone have pics of swarovski crystals so I will be able to tell if they're authentic?
and would it be relatively cheaper to buy your own crystals and have the karigar include them or have him get the crystals and include them?