Green earrings are what I reach for when everything I'm wearing is black or navy and I need one thing to stop me looking like I'm in mourning for my own outfit. Plain jumper, plain coat, and then a pair of green studs or drops doing all the talking. I didn't own a single pair until a friend's wedding a few years back, when I panicked about looking washed out and bought the cheapest emerald hoops I could find on the way there, and they ended up being the only compliment I got all day, which tells you something about how little effort this colour actually needs.
The shades that are easiest to live with sit at either end, oddly. A deep bottle or forest green reads almost like a neutral, it goes with the same things navy does and nobody questions it. A soft sage or olive is nearly as forgiving and sits well against warm skin tones that sometimes struggle with jewel tones. Where it gets harder is the bright acid or lime greens, lovely on their own, but they want a very specific outfit built around them rather than slotting into one you already own. Finish matters too, a matte or brushed green stone looks more expensive than a glossy one, and gold settings tend to flatter green stones more than silver does, though that's taste more than rule.
In the shop, pick the earring up properly rather than just looking at it on the card. A well made pair has a clasp that clicks shut with a bit of resistance, not one that falls open if you breathe near it, and the colour should look the same from the front as it does when you tilt it towards the light, cheap green glass often goes cloudy or flat at an angle. Check the back posts aren't rough, and give a drop earring a gentle shake, if it rattles or the stone shifts, that's glue doing a job it shouldn't be doing.
Green clashes hardest with red and with anything else fighting for attention, patterned tops, busy prints, another statement piece in a different colour. Keep the rest of you fairly quiet and let the earrings be the one loud decision. And they're not the move for very formal, monochrome evening looks where the whole point is restraint, or for interviews where you want people remembering what you said rather than what you had on your ears.
Tomorrow I'd wear mine with a cream shirt, dark jeans, and nothing else fighting for the credit.