Indian glass bangles will generally have a fair amount of excess glitter on them when they are new. That excess loose glitter sheds away on its own when worn, leaving just the glitter that is actually attached to the bangle.
If you want to help the process along, brush the bangles gently on a pair of denim jeans to loosen and remove excess glitter.
To be sure you get it all, after brushing the excess glitter of the glass bangles, use an aerosol hairspray to spray them down. Let the spray dry completely before putting the glass bracelet on your wrist. A couple light coats are better than on thick coat.
Some people will even use a spray clear coat on their glass bangles.
Personally, I like the extra glitter! The more sparkle the better in my world!