The cushion cut is the shape most often chosen for a three-stone engagement layout. The soft corners sit naturally against two smaller side stones, the square outline frames well in a halo or without one, and the crushed-ice or brilliant facet pattern reads as a single glow rather than a sharp geometric flash. For wholesalers stocking cushion moissanite, the three-stone SKU is where a lot of repeat orders come from. The production side, though, has a few traps that separate jewelers who get reorders from jewelers who get returns.
Matching the side stones
The most common three-stone layout uses a square cushion center with two smaller cushion or round side stones. Round sides are easier to source because round melee is a staple. Cushion sides look more cohesive but require matched cushion melee, which is a smaller parcel size and costs more per stone.
Whichever side shape you choose, the color and clarity must match the center exactly. A DEF VVS center next to a near-colorless VS side stone is visible the moment the ring is worn. Buy center and sides from the same supplier, in the same shipment, and ask for them to be graded together. Our crushed ice vs classic cushion guide covers the facet patterns; the matching rule applies to both.
Center size and side size ratio
The classic proportion is a 6mm to 6.5mm cushion center with 3mm side stones. That ratio gives enough visual weight to the center that it remains the focus, while the side stones widen the ring enough to feel bridal. Going larger on the sides, above 3.5mm, makes the ring read as a band rather than a solitaire, and the center loses its anchor.
Stock 5x5mm, 6x6mm, and 7x7mm centers. The 6x6mm is the fastest mover. The 5x5mm is the entry price tier. The 7x7mm is the upgrade ticket and moves slower but at a higher margin. Avoid the 4x4mm three-stone; at that size the side stones crowd the center and the ring looks busy.
Metal tone interaction
Cushion moissanite in DEF color is bright white, but the cut's soft corners tend to pick up the color of the metal they sit in. In yellow gold, a cushion reads slightly warmer than a round of the same grade. In rose gold, the warm interaction is part of the appeal. In white gold or platinum, the cushion reads at its whitest.
Most three-stone cushion orders come in 14k white gold. If you are building a display line, carry one white gold, one yellow gold, and one rose gold version. The white gold sells fastest; the yellow and rose sell to customers who have already decided they want a warmer metal.
Setting labor
Cushion corners must be protected. Unlike a princess cut, which has sharp 90-degree corners, a cushion has rounded corners that are less likely to chip, but the pavilion still carries edge facets that can be nicked if the prongs sit too high. Four prongs at the corners, or a halo, are the two standard solutions. A halo adds roughly 0.3mm of face-up size all around, which is a strong upsell because the customer perceives a larger stone without paying for a larger stone. Our cushion halo bestseller notes cover that SKU in depth.
Reorder patterns
The three-stone cushion reorders in clusters. Once a retailer sells one, customers come in asking for the same ring in a different size or metal. That means the safest stocking move is to buy the center sizes that you have already sold, not the sizes you hope to sell. If your first order was a 6x6mm white gold three-stone and it moves, reorder another 6x6mm before adding a 5x5mm. Cushion customers tend to want the ring they saw on a neighbor, not a different one.
For new jewelers entering the category, the stock by mm guide explains why cushion moissanite is sold by millimeter rather than carat weight, which is the single most common buying mistake in this cut. Three-stone production is where that millimeter discipline pays off most, because the side stones and center must line up on a mounting that was cast to a millimeter tolerance.
Pricing and margin
A three-stone cushion carries a slightly higher stone cost than a solitaire because you are buying center plus two sides, but the retail ticket jumps more than the cost does. Customers shop three-stone rings as a bridal set, not as a single stone, and they compare the layout to diamond three-stones that retail at several times the price. That gap is where your margin sits. The side stones add perceived size without adding center-stone cost, because a 6mm center flanked by two 3mm stones reads as a much wider ring than a 6mm solitaire.
Stock the halo version as the upsell tier and the plain three-stone as the entry tier. Both use the same center stone, which means you only buy one parcel of cushion centers and build two SKUs from it. That is the most efficient way to enter the three-stone category without tying up capital in multiple center sizes.