There's a particular point in January, when everything in the wardrobe has gone grey and navy and apologetic, that a blue necklace earns its keep in a way it never quite manages in high summer. It sits against a plain jumper and does all the work a jumper can't do on its own, and you remember why you bought it in the first place.
If you've none at all, start with something in a mid denim or cornflower tone rather than anything inky or electric. The paler blues go with more than you'd expect, grey, white, camel, even black without looking like an accident, and they don't demand a particular mood the way a vivid cobalt does. Navy is the other sensible first buy, close enough to black that it behaves itself but with a bit more warmth near the face. Save the brighter turquoises and true cobalts for later, once you know how often you actually reach for colour near your collarbone, because the honest answer for a lot of us is less often than we think when we're stood in a shop under lights designed to make everything look wonderful.
How it wears depends entirely on what it's made of, and this is where I'd slow down and actually look rather than just liking the colour from across the room. Glass and good resin beads keep their colour for years and feel pleasantly weighty without pulling at the clasp. Painted or dyed beads are the ones to watch, they can fade patchily rather than evenly, so a necklace that's been a cheerful teal for two summers can end up a sort of tired grey blue on one side only, usually the side that caught more sun on the windowsill. Enamel pieces are lovely to the touch, smooth and cool, but chip if they're ever dropped onto anything harder than carpet, so they live better in a soft pouch than loose in a drawer with your keys and everything else. Whatever it's made of, keep it away from perfume and hairspray before you put it on rather than after, and wipe the clasp occasionally, since that's the part that corrodes first and nobody ever thinks to check it until it's seized solid.
In the shop, check the clasp opens and shuts properly with one hand, because you'll be doing this in a hurry most mornings and a stiff lobster clasp is a small daily misery. Look at the back of any beads for consistent colour rather than just the front, hold the chain up to a window if there is one to see whether it's genuinely blue or just looks that way under shop lighting, and check the length actually sits where you want it rather than disappearing under a collar. A necklace that needs constant adjusting through a whole day isn't one you'll bother with after the first few wears, however good the colour looked on the way out the door.
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