Capricorn (Dec. 22-Jan. 19): Black Nail Polish Black nail polish is polished, practical, and bold — just like Capricorns. You're not one to chase trends or jump on the latest buzzy nail polish colour. Instead, you prefer sticking with a timeless colour that goes with everything, like the Orly Diamond Potential Nail Polish ($10) Image Source: orlybeauty.com Orly Diamond Potential Nail Polish $10 from orlybeauty.com Buy Now