You can judge most of it from the listing. Look for a metal number rather than a colour word, find out which of the four kinds of gold it is, check whether nickel is mentioned at all, and see whether the stone is described as natural, treated or lab-created. If a page won’t answer those, that is itself an answer.
Most jewelry looks the same in a photograph. A $14 ring and a $340 one are both shot on white, lit from the same angle, and described as timeless.
Everything you can actually check is in the words next to the picture. And online, the useful skill is noticing what a listing doesn’t say.
