As it turns out, the blue nail theory isn't too dissimilar from the viral "red nail theory." It has to do with your nail polish color and what it signifies. To learn more about this phenomenon ...

Place under direct light to see the full rainbow effect. Get the look: Look for a black linear holographic polish like Mooncat's Nail Polish in Cruel Mirage ($15). Florals for winter? Actually ...

Is it blue? I'm leaning toward purple ... a dark shade but don't wanna settle for navy or black. I’m in loooove with this creamy nude nail polish for a subtle manicure. It’s for anyone ...

That’s why colored crystals – in bold blue, aurora and pearl ... First, paint your nails with a good quality black nail polish and swipe on a glossy top coat to create a smooth base.