There's a reason we reach for black nails when the temperature drops: they look good with everything. But this winter, inky blue deserves a turn. Bessie's Deep Sea nails are a moody starting point—short round black nails with a glowing teal-blue cat-eye effect that emerges as they catch the light.

In Allure's October 26 winter color forecast, deep sapphire blue sits among the season's dramatic, jewel-toned pedicure shades. We like borrowing that same color logic for a manicure. It's a styling suggestion, not a claim that the exact runway or celebrity nail is available here.

Is midnight blue the same as cobalt?

Not quite. Midnight or inky blue sits close to black, with its color showing most clearly in daylight. Cobalt is brighter, cleaner, and impossible to mistake for a neutral. If you're after the statement version, Cobalt is a glossy, medium-almond set in saturated blue. It looks particularly sharp with gray wool, crisp white shirting, or a silver cuff.

Deep Sea, by contrast, isn't a flat navy polish: its black base and teal-blue cat-eye reflection give it a shifting, almost underwater quality. That distinction matters if you're choosing a set from photographs.

How to try blue without painting the whole nail

For a lighter approach, Blue French Tips place cobalt-blue tips over sheer pink. You still get the cold-weather pop of color, but the negative space makes the manicure feel easy to wear on a Tuesday, not just for a night out.

Our earlier blue French tip edit explores the fashion side of that look. For more single-color options, browse Bessie's Solid Colors collection. Consider this permission to retire plain black for one manicure and try something a shade more interesting.