This is OPI's Princesses Rule, a pale pink shimmer which is sheer, yet buildable, with subtle white, gold, pink, and even green sparkle. Released with the Princess Charming collection quite some time ago, it's now a permanent part of the collection, and is apparently their most popular pink. I'm utterly unsurprised by this, as for me this is the perfect pink - unobtrusive but not boring, pretty but relatively subtle, and sparkly without being over the top.
It's my go-to polish when I don't have a lot of time for a careful application: three coats gives the above effect, but if I'm pressed for time, one coat still looks polished and groomed with minimum effort. As it's a pale shade, it doesn't show chips easily, and it's hardwearing too - I can stretch an application out for five days or so with a good topcoat. Application is smooth and non-globby, drying time is pretty decent, and it comes with a Pro Wide brush, which I personally love.
And indeed - I've used a quarter of a bottle. I barely manage to make a dent in most polishes before they go thick and unusable (or unloved), so this is a real rarity.
If you like the look of this beautiful polish, you can grab it from BeautyBay, where a 15ml bottle will cost £9.95. Which is definitely worth it.