A buyer approves a CAD render of an engagement ring and tells the factory to go straight to silver, we trust you. The factory pours 50 pieces. The buyer customer tries one on and the shank spins around the finger because the stone is heavier than the CAD anticipated — the wall was too thin to balance the setting. Fixing 50 cast rings means re-casting the whole run. The $25 wax prototype that was skipped would have shown the problem in ten seconds. This article explains why a wax step is not optional on custom work, and what to check when you receive one.
What a wax prototype tells you that a CAD cannot
A render shows geometry. A wax you can hold, weigh, and put on your finger shows three things a screen cannot: (1) actual wall thickness in your hand — a 1.2 mm wall on a render can feel paper-thin on a heavy head; (2) balance on the finger — does the ring spin? (3) how the stone sits in the seat before any metal is wasted. We print wax prototypes on a DLP printer at 25 micrometer layers (see 3D-printed wax resolution and fit), which reproduces surface detail close to cast metal. The cost is $25–$60 per piece plus shipping, and the turnaround is 1–2 days. Compared with the $8–$20 per piece it costs to cast and finish a silver ring, the wax pays for itself if it catches one error on a 20-piece run.
The three-step approval loop
We run custom jobs as three steps: (1) CAD review with dimensional PDF — the client confirms ring size, wall, stone seat, and stamp position; (2) wax prototype printed, photographed, and shipped — the client puts it on a mandrel or a finger, measures the inner diameter with a caliper, and confirms wall feel; (3) first-piece cast in silver — we send one finished piece before the full run. The timeline is laid out in CAD to production: a custom ring timeline. Most revisions happen at step 2, where they are cheap. We have seen buyers skip step 2 and end up with 100 rings at the wrong size because the CAD was modeled in inches instead of millimeters — the kind of error described in what a factory needs from your CAD file.
What to check on the wax before approving
When you receive a wax, check: inner diameter with a caliper (should match the target ring size times 1.02 for silver shrinkage, per silver casting shrinkage and tolerances); wall thickness at the thinnest point (should be 0.6 mm or greater for silver); the stone seat — drop your actual stone in, it should sit flush with a slight press; undercuts — hold it under a light, look for trapped pockets that investment cannot escape; and the finish (high polish wax should be smooth, no layer lines visible under 10×). We include a measurement card with every wax so the buyer can confirm numbers without guesswork.
What a wax costs vs what it saves
A wax prototype costs $25–$60 and two days of lead time. A mis-sized 100-piece silver run costs roughly $800–$2,000 in cast and finished metal, plus a two-week delay while the corrected wax is printed and the run is re-cast. On the numbers alone, skipping the wax only saves money if the design is already proven on a prior style. For first-time designs, the wax pays for itself the first time it catches a wall that is too thin, a seat that is too shallow, or a ring size that is off by half a size. We have had buyers skip the wax on a 50-piece engagement ring run and discover the head sat 2 mm too high for a standard wedding band to stack underneath. Rapid prototyping methods are described in references such as the rapid prototyping entry on Wikipedia.
When a wax is optional
We do not push wax prototypes on every order. If the buyer has already approved a wax on a prior style and is reordering the same design at a new size, we skip straight to casting. If the order is a production band with no custom geometry, the CAD step is enough. The wax step is mandatory on: first-time designs, one-off engagement rings, pieces with complex pavé, and any order above 30 pieces. The first-piece QC process is documented in our order checklist.
How much does a wax prototype cost?
$25–$60 per piece depending on size and complexity, plus DHL shipping. It is credited against the first production order on most runs.
Can I approve the wax from photos?
For simple bands yes. For rings with stone seats or wall-critical geometry, we strongly recommend the physical wax on a finger — photos miss balance and feel.
What if the wax breaks in the mail?
Wax is brittle. We ship in a padded box and print a second prototype at no charge if the first arrives damaged.
Starting a new custom design? HOLYCOME prints a wax prototype for every first-time design and ships it with a measurement card. Send us your CAD and target ring size — we will return the wax and a dimensional PDF within 48 hours.
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.
