The first green necklace I owned was a bottle green glass pendant from a market stall, bought because it matched a dress I wore once. Within a fortnight the colour had gone cloudy where it sat against my skin, and that taught me that cheap glass and resin don't age well once they meet body heat and perfume.
Green necklaces have real limits worth knowing before you buy. A heavy jade or malachite piece looks wrong with anything delicate or office appropriate, it wants a plain neckline and a bit of confidence, not a blouse with its own pattern going on. Pale mint or sage toned stones can wash out anyone with cooler skin, and I learned that the hard way with a seafoam pendant that made me look faintly unwell under office lighting for a full winter before I admitted defeat and gave it away. What actually separates a good green necklace from a disappointing one comes down to the stone or glass itself, plating, and the clasp, in that order. Real malachite, jade, emerald glass or good quality enamel holds its depth of colour in different light, while cheap dyed stone or coloured glass looks flat and slightly plastic the moment you step outside. Gold plating that's actually plated, not just gold toned base metal, won't turn your collarbone green after a few wears in the rain, which is a specific and unglamorous failure I've had twice. The clasp matters more than people admit when they're buying, a lobster clasp with a bit of weight to it stays done up through a day of coat collars and scarves, where a thin spring ring will come open in your bag and you'll find the necklace tangled round your keys. Finish wise, look for edges that are smooth against the throat, because a rough setting on a pendant will catch on jumpers and eventually loosen the stone.
Green suits autumn and winter best, oddly, when everyone else is in black and camel and a deep forest or emerald stone against a dark jumper does more than most bright colours manage. It struggles in high summer against tanned skin and pale linen, where it can look heavier than the season wants. A good green necklace earns its place at a dinner, a wedding guest outfit, or any day you want one piece of colour to do the talking against neutral clothes, but it's the wrong choice for anything busy or floral where it just gets lost. This is one for anyone who likes a single statement rather than layers of thin gold chains, and who doesn't mind a necklace with a bit of presence doing most of the outfit's work.