If you want to make blue eyes pop, experts advise picking an orange shadow. At the opposite side of the colour wheel to blue, orange is considered a complementary colour and therefore is instantly capable of accentuating blue irises.
Trouble is, inexpertly applied bright orange eyeshadow will make you look like Coco the Clown.
Beauty, like fashion, changes each season. To keep up to date you can't ignore the rules, but you can adapt them.
For example, bright orange may be near impossible to pull off, but swap it for a deep, burnished copper and you'll look pretty, not odd.
Word of advice - keep the tangerine for your toenails. The vibrant hue is great, but perhaps too harsh on the eyelids for most of us.
It's the same for any eye colour, so here are some tips and tricks on the season's hottest shadow colours.
Shimmering blue shades dominated the spring/summer catwalks. At Kate Spade, Clements Ribeiro and Dior makeup artists put blue - which hasn't been that popular since the 80s - on to our radar.
Stella McCartney kept things simple - and fresh - with a rich teal liner applied to the bottom lashline only.
The look at Michael Kors, however, verged on 'don't try this at home'. Models marched out wearing thick turquoise liner, not on the upper lashline, but 'floating' just above the crease.
As counterintuitive as it sounds, blue shadow doesn't look great on blue eyes. Brown-eyed girls can embrace blue shadow with aplomb, it will set off their dark eyes perfectly.
Although it works backstage, look-at-me orange is just too difficult to pull off if not applied by a superstar makeup artist.
But if you love the look, minimise risk by opting for softer sherbet shades rather than full on tangerine. Peach, too, is a sweet, spring-like colour, and much easier to wear.
Peachy shades are softer on the skin but still ultra modern, especially when teamed with brown, rather than black, mascara.
Metallics look great whatever the season, but this time around the go-to shade for smouldering eyes is copper. A sexy, shimmery mix of orange and brown, it is almost universally flattering.
Worn bold, or more subtle, copper always appears luxe. Team with dewy skin and nude lips for a clean-faced natural look, oh and a sweep of brown liner won't hurt either.
Forget neon and magenta - paintbox pinks have no place off the catwalk. You'll either look like you need eye drops, or that you've applied blusher in the wrong place.
But don't rule all pink shades out - mid pink and coral are lovely, particularly on paler skins.
At Catherine Malandrino Black Label, MAC makeup artist James Kaliardos favoured a wearable pinky lilac. The effect was fresh and modern, without trying too hard.
At a glance
Green eyes? Consider slate grey, taupe, purple, smoky silver, metallic sage and espresso.
Blue eyes? Try light pink, brown, slate, terracotta/copper, purple, orange/peach, bronze and gold.
Grey eyes? Pick shadows in black, charcoal, purple and deep brown.
Brown eyes? Stick with cobalt, eggplant, greenish gold, copper, navy, gold and pink shades.
Hazel eyes? Opt for green, gold, brown, bronze, lavender and eggplant.