hey proto - is that 100rs for 12 (!) or do you mean 1 gross (12 dozen)?
the thing is, other lesser quality stones can easily be passed off as swarovski crystals. i know this because of the research i put in when i first started using them to make sure i wasn’t buying fakes. although sometimes it can be hard as you can get some really high quality fakes; in which case it probably doesn’t matter too much as long as the crystal is cut properly and the facets inside meet and points and don’t overlap.