OPI DS Glamorous is a highly desirable blurple (blue/purple) linear holographic polish that's become basically impossible to get. It occasionally pops up on eBay at exorbitant prices---think two or three digits---or, every once in a blue holo moon, someone will find one in an off-trend salon or nail supply store ("dusty"). Ninja Polish has wisely anticipated that a good dupe would sell like hotcakes and released the pretty you see below, named Glamorous, as part of their Spectrum collection.
I'm not sure exactly why I immediately snatched up my own bottle of Glamorous. It could very well be due to the hype surrounding OPI DS Glamour. Fortunately, that's an existential crisis I don't actually have to deal with, as I'm a sucker for blue linear holos anyway. With that in mind, Glamorous is actually a lot more purple than I expected - I would describe it as a deep denim blurple. I haven't actually tried it on yet, but so far I prefer Hits Apolo to fill the (quite important) ocean blue holo niche in my life. Glamorous is US$11 at Ninja Polish, although it's currently out of stock and will probably be hard to get for a while due to the insane popularity of OPI DS Glamour.