This is such a gorgeous product, comes in a sleek glass pump bottle and is made up of little white pearls. When press down the pump, some of these pearls get sucked up and crushes, so you end up with a white shimmery liquid. I find that only one pump is enough to do my whole face, so a little goes a VERY long way. The regular version of this primer costs £40 for 30 mls, so it's not cheap, but as I said it does last a long time and it's a wonderfully silky smooth primer. Just feels really luxurious, as you would expect from Guerlain.
The Pearly White version is slightly shimmery, but once you've blended it all out, it just leaves a slight sheen on your face. As you would use it under your foundation and/or face powder, the shimmer would not be noticeable. It does help control shine and make you make up last longer.