"Sidestone" describes what happens beside the center, not the shape of the ring itself. Small diamonds run along the band, or wrap partway around the main stone, adding sparkle without adding size. That is why you will find sidestone detailing layered onto solitaires, halos, vintage settings, even bezels, across almost every style on this site. Nobody sets out to buy "a sidestone." They fall for a ring, and the sidestones are quietly part of why it caught their eye.
Most of what is here is a setting, whoever built it, which means the center stone is a call you make with us, lab or mined, rather than one the case makes for you. A handful come complete, the main stone already set, and those are marked plainly. Either way, the sidestones themselves are already in place. The size, the shape, the origin, all of that decision lives with the center, not the detail running beside it.
All that small stonework down the band gives the free yearly check that comes with anything bought here, something real to do. Too far to visit? Text the design you love and the center stone you are after, and the photos come back from a person, not an autoresponder.