Every other page on this site is about something added: extra stones, extra detail, an extra bit of light catching the finger somewhere. Classic goes the other way. These are the settings built with a clean band and honest proportions, nothing extra competing for attention. It is not the boring choice. It is the confident one.
Every classic setting on this page is exactly that, a setting, with no exceptions here, so the center stone is chosen separately, with us, natural or lab grown, whichever house built the piece. Metal runs mostly white gold and platinum on this shelf; if yellow gold is what you are picturing, ask us, since it is not the default here. A ring this plain has nowhere to hide a flaw, which is exactly why the stone matters more on a classic setting than almost anywhere else.
On a ring this plain the prongs do all the quiet work, which is exactly why the free yearly check that comes with anything bought here is worth using. Get the stone right, and a plain setting never looks dated, because it was never chasing a date to begin with.