Accent diamonds sit beside your diamond rather than all the way around it, which is the key difference from a halo. Depending on the design, they may run alongside it, trace part of its outline or climb toward the bail, the loop the chain passes through. Look at each setting's images to see where the accents fall and how much of the center's edge stays open, since that open edge is what keeps the main stone's shape crisp.
Placement also changes how the pendant hangs. Accents above the stone draw the eye up toward the chain, while stones on either side widen the piece so it sits like a small bar of light across the chest.
Think of the three as steps of sparkle. A solitaire is one diamond and nothing else, the most minimal choice. A halo surrounds the stone and makes it look larger. A side stone diamond pendant sits between them: it adds light and a little width without hiding the outline, so an oval, pear or emerald keeps its silhouette. If a full frame appeals but feels too busy, this is the middle path. Compare halo pendants to see the difference side by side.
The center and its accents sit close together, so their tones should agree. In white gold or platinum, a center at the upper end of near colorless avoids looking tinted beside bright accents, while yellow and rose gold give more leeway. Cut comes first for sparkle, and eye clean clarity is enough at necklace distance. Begin with the stone in the pendant builder, then pick the setting that frames it best.
Shape matters as much as color. An elongated center such as an oval or pear looks larger per carat and gives the accents a clear line to follow, while a round keeps the look classic and balanced. Pointed shapes still need a V prong at the tip.
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Accents add a little width, so check in the photos that the pendant will still lie flat under a collar or a knit if you plan to wear it daily. A fine chain keeps the piece light, while a slightly heavier one balances a wider pendant with several accents. Either way, choose a length that lets the stones rest on skin rather than fabric, where they catch the most light. If you still need something to hang it on, browse chain necklaces.