A jewellery buyer in Manchester ordered twelve three-stone rings with a 6.5 mm centre and 5.0 mm side stones. The sides were too close to centre size, the face-up read as a row of equals, and the batch moved slowly. Their next order came back at 4.0 mm sides. Same centre, same price point, sell-through doubled in nine weeks. The side-stone ratio is the single most missed spec on a three-stone build, and it is a margin lever, not a preference.
Below are the four centre-to-side ratios we quote on custom moissanite three-stone rings, with the face-up width, seat-cut labour and the buyer profile each one suits.
The 2:1:2 ratio: the romance default
We call it the 2:1:2 split: a 6.5 mm centre flanked by two 4.0 mm sides. The centre still dominates, the sides read as supporting points, and the total face-up width lands around 15.5 mm across the knuckle. This is the ratio that photographs best because the eye locks on the centre first. Build cost runs about 30 percent above a solitaire of the same centre stone, driven by the two side seats that have to be cut to match the crown angle. Our setting type overview puts the three-stone head next to halo and bezel for cost comparison.
The 1:1:1 ratio: the statement build
Three stones of near-equal weight, typically three 5.0 mm stones on a size-six finger. It reads modern and architectural, and it sells to clients who want finger coverage rather than a focal stone. The catch is seat geometry: three equal crowns on one shank mean the shared-prong basket has to be milled thinner, which costs us about 10 percent more in wire than the 2:1:2 build. We warn retailers that the 1:1:1 looks crowded on fingers wider than 18 mm. The crown-angle vocabulary we seat against follows GIA's 4Cs reference; moissanite is not GIA-graded, but the angle language transfers to our CAD.
The graduated ratio: oval and pear centres
On an elongated centre, say a 9x6 mm oval, we drop the sides to 3.5 mm round or 4x2.5 mm pear. A graduated side set keeps the centre from looking stubby. The mistake we see on imported three-stone rings is round sides that fight the oval's length; the eye reads the round sides as interruptions. Buyers choosing centre shape should read our moissanite shape guide before locking side stone cut, because oval and cushion need smaller sides than a round.
Carat math and retail pricing
Buyers ask us to price side stones by the piece, but we quote by the matched pair. A 4.0 mm round moissanite in our standard colour grade runs roughly USD 45 to 60 per piece, sorted within 0.1 mm diameter tolerance. The seat-cut labour adds about 25 minutes per ring on top of a solitaire build. When a retailer wants a trilogy across three centres (round, oval, pear), we sort one melee lot so all sides match in tone. Our ring design process overview shows how the ratio feeds the CAD and the final proforma.
Prong count on a three-stone head
We build three-stone heads on six prongs for the centre and two prongs per side stone. Slim four-prong centres on a trilogy bend more easily because the shoulder carries extra side-stone weight. If the client works with their hands, we step the centre prong wire to 1.15 mm and raise the gallery 1.6 mm off the finger. Retipping frequency on a trilogy runs about one visit per four years under daily wear, versus three years on a thin-prong solitaire. Our prong style write-up covers the wire gauge numbers in detail.
What side-stone size suits a 6.5 mm centre?
4.0 mm sides give the 2:1:2 romance split and the best sell-through. Go to 5.0 mm only if the client explicitly wants the 1:1:1 statement look.
Do three-stone rings cost more than solitaires?
About 30 percent more on build, driven by two side seats and matched-pair sorting. The retail price gap usually runs larger, so the trilogy carries the higher margin.
Can side stones be upgraded later?
Only if the shared-prong seat has enough wall. We decline roughly half of upgrade requests because the shoulder is already milled to the original side size. Spec the sides at first sale.
Which centre shape reads best as a trilogy?
Round and oval move fastest. Pear and marquise read dramatic but come back narrower in sell-through; we stock them to order rather than pre-build.
How side stones read on a photo versus on the finger
A ratio that photographs wide can look narrow on the hand, because the camera compresses the side stones against the centre. On a 15 mm face-up width, a side-stone set that reads balanced in a render can look half its size on a real finger. We photograph three-stone rings on a size-six mandrel at a 45-degree angle, the angle clients see when they try the ring on, so the buyer approves proportions that match the hand, not the lens. This is why we do not quote side-stone size from a flat catalogue image; we measure the ratio against the face-up spread the client will actually wear.
Send us the centre shape, diameter and the finger width you sell to. We return the recommended side-stone ratio, prong count and face-up width on the signed sheet before CAD opens. Ask us to spec your next custom moissanite three-stone ring.
Frequently Asked Questions
Is moissanite a good diamond alternative for retail buyers?
Yes for price-sensitive customers who want brilliance and hardness. Moissanite ranks 9.25 on the Mohs scale, holds up to daily wear and costs a fraction of a natural diamond of the same size, so it resells fast in bridal and fashion lines.
What is the minimum order for wholesale moissanite?
MOQ starts at 50 pieces per design for stock items. Custom cuts and private-label settings usually start at 100–300 pieces depending on the mold.
Do you provide certificates with moissanite stones?
Yes. Every parcel ships with GRA or IGI documentation listing carat weight, color grade and cut. We recommend passing the certificate to your end customer for trust.
How long does sample and bulk production take?
Samples ship in 3–5 days. Bulk runs take 15–20 days under 500 pieces, and 25–30 days for custom work.
