The foundation of any good smoky eye is a neutral colour, whether it be a bold metallic or a smouldering ebony. Emma Stone tested this theory at yesterday's premiere of Gangster Squad by opting for a shimmering emerald to complement her kelly green eyes. This new neutral, which is also Pantone's 2013 Colour of the Year, gives a perfect pop of colour without being tacky, especially when smudged around your eyes. The trick? Just keep the rest of your makeup simple and streamlined. Go for brown eyeliner and mascara, which blends better with the emerald hue instead of a harsh black. And Emma kept her lips and cheeks in the pale pink family for a perfect balance. Pantone's trendiest shade is easier to pull off than you'd think.