Here is Color Club We'll Never Be Royals, which was in my 2016 favorites:
back in the early fall, along with another Color Club polish from the same line (which is Oil Slick, and last I checked they were still available). It's a multichrome - you can see the halo effect in the bottle here. The base color seems to be a dark blue-leaning purple, but then it shifts around toward more of a red-violet or fuchsia, and also has hints of orange. It's beautiful. Beautygeeks has swatches of the whole collection in case (like me!) you missed it when it first came along.