I'll tell you what I tell anyone holding a silver ring up to the light in a shop, turning it this way and that under those awful fluorescent tubes: forget what it looks like there and think about what it'll look like against a kitchen sink full of washing up, because that's where it'll spend most of its life.
Sizing is the thing people get wrong twice before they get it right, and I include myself in that, having bought one a size too big for a wedding because my finger was swollen from the heat and then wondering for two years why it kept sliding round to meet my palm. Rings sit differently depending on the time of day, the weather, whether you've had a salty lunch, so try it on at the end of an ordinary afternoon rather than first thing, and if it's a band rather than something with a stone, go for a touch snugger than feels sensible, because plain bands have nothing to catch on a knuckle and will work their way off a loose finger within a week. Watch for anything that pinches at the sides when you make a fist. That discomfort does not improve with wear, whatever the assistant tells you.
Quality shows itself fairly quickly with silver, and not always where you'd expect. Proper sterling will have a hallmark stamped somewhere on the inside of the band, tiny but there, and its weight tells you something too, a ring that feels suspiciously light for its size is usually silver plated over something cheaper, and that plating wears through at the high points within a year, leaving a dull yellowish line that no amount of polishing cloth will shift. Check the setting on anything with a stone, give it a gentle wiggle, if it moves at all, send it back. Finish matters more than people admit: a good one will have smoothly rounded edges on the inside, nothing that catches on wool or snags tights when you're pulling them up in a hurry.
Where silver lets you down is anywhere it's going to meet water and chemicals all day, washing up liquid, chlorine, hand sanitiser in heavy rotation, it tarnishes and dulls faster than people expect from something marketed as low maintenance. It also doesn't sit well stacked against anything gold, the two together look like you couldn't decide, so pick one for the day and stay loyal to it.
Reach for silver when the rest of what you're wearing is cool toned, understated, and you want something that'll look right in ten years without having tried too hard to get there.