From approved render to finished hand
An engagement ring looks like a single object, but on the bench it passes through six distinct stations, and each station can stop the job if the previous one did its work badly. Understanding the sequence helps a buyer or boutique owner read a quote, anticipate delays, and judge whether a factory's lead time is realistic or padded.
1. Approved design and the wax pattern
The process starts with a locked CAD file, not a sketch. Once proportions, head size, stone specs, and finish are approved in writing, the file is printed as a resin or wax pattern. This pattern is the physical shape of the ring. Gates and vents are added at this stage by the caster, and those additions are milled away after casting, so the CAD must leave clean geometry where gates will attach. A pattern that looks perfect on screen but has thin sections the caster cannot feed will fail in the flask, and the whole cycle restarts.
Stone selection happens in parallel. The center stone's measured diameter decides the head seat; if the stone arrives smaller or larger than the spec, the head is adjusted before casting, never after. This is why confirmed stone dimensions travel with the CAD file, not as a footnote.
2. Casting
The pattern is invested, burnout, and cast in the chosen alloy. The result - a casting sprue with a rough, slightly porous skin - is never the finished ring. It is a blank. Casting temperature, flask temperature, and alloy grain all affect how much cleanup follows. A well-cast ring arrives at the bench with minimal flash and even grain; a poorly cast one arrives with porosity, shrink, or incomplete sections that mean re-casting, which resets the lead time by days and can push a delivery past a proposal date.
3. Fitting and sizing
Before any stone is set, the shank is sized and rounded. The ring is worked on a mandrel, checked for roundness, and the wall thickness is assessed. This is the station where a too-thin shank is discovered and reinforced. Stones wait; sizing after setting risks cracking them or loosening prongs. Production houses size first, always. A ring with stones embedded in the band (eternity styling) is sized with extreme care or rejected for sizing altogether, because stretching a set band cracks stones and pulls prongs.
4. Stone setting
Setting is done by hand under magnification. Prongs are raised, the stone seated, prongs pressed over the girdle, and each prong tip shaped and finished. Pavé work seats dozens of small stones in a single pass. The bench checks level, contact under the girdle, and that no prong rests on a facet. A stone that rocks in its seat is reset now, not after polishing - abrasive compound trapped under a girdle hides problems and corrodes over time.
5. Finishing and polishing
After setting comes the multi-stage polish, but on bridal work the polish is deliberate: a high polish on the shank, a satin or sandblast on selected surfaces for contrast, and never a polishing mop near the stone - especially on softer gems like opal, emerald, or tanzanite. Milgrain, engraving, and texture are applied before final polish, because polishing after engraving would soften the detail and round off crisp milgrain beads.
6. QC and set staging
The finished ring moves to inspection: stone security under pressure, prong tips smooth against skin, finish consistent, size measured on a certified mandrel, and the karat mark verified. Rings sold as bridal sets are staged together so the engagement ring and bands match in tone, finish, and profile. Anything that fails goes back to the station that caused the fault, not forward - a ring that skips QC to hit a date almost always comes back under warranty.
Where the time actually goes
Quoted lead times look mysterious until you know the handoffs. Casting itself is measured in hours; the queue between stations is measured in days, and a single re-cast can wipe out a full week. A rush order is rarely faster casting - it is jumping queues, which raises the risk that fitting and QC get rushed. For a boutique selling engagement work, set expectations around station capacity, not around the sum of operation times, and ask which station is the current bottleneck when a date slips. A factory that names the bottleneck honestly is managing the relationship; one that always says "it's on the bench" is guessing.
A finished bridal ring is evidence of a sequence held together, not a single craft moment. When you commission a run, ask for photos at the wax and casting stages, not only the final shot - those earlier images tell you whether the factory controls the process or just repairs the result. See how our engagement ring program stages production and quotes each station.
The Wikipedia entry on engagement rings gives an independent overview of engagement ring traditions and settings.
Frequently Asked Questions
What ring sizes can you supply in bulk?
US sizes 5–12 including half sizes. Send a size breakdown with your order and we cast to that curve; comfort-fit inner bands reduce resize requests.
Can I order a mixed size run instead of one size?
Yes. Mixed runs are standard for wholesale: specify quantity per size and we pack and label by size at no extra labor cost.
What is the MOQ for custom ring designs?
50 pieces per design for existing molds; 100–300 pieces when a new mold or CAD model is required.
How should I price rings for retail margin?
Most partners use a 3–4x markup on FOB cost for sterling and 2.5–3x for moissanite solos, which keeps landed cost under 30% of retail.
