Neptune is a denim blue packed with gorgeous silver fleck like shimmer. I really, really love it. It's beautiful and has definitely become a favorite blue.
The formula was so awesome. It applied easily and only two coats were needed for opacity. It has great quality and you don't have to break the bank for it, which I love. Literally the only downside was the clean up which took some extra time since it's so saturated.
I'm very satisfied with Neptune! It's a fantastic blue that doesn't disappoint one bit.