How long does CAD design take for a custom ring?

A week, if I'm being honest and nothing goes sideways. Two if the stone is odd-shaped or the design is complex. Anyone who says three days is either working with a templated model they're calling "custom" or they're not sleeping.

Here's the thing about CAD for a custom ring - the modeling itself is maybe four to six hours of file time. But that's never the bottleneck. The bottleneck is the back-and-forth. You send a render. The client stares at it. They think they want a thinner band but then they're not sure. They email three questions at midnight. They want to see it in rose gold and yellow gold and white gold. That's where the timeline stretches.

Last spring a woman named Priya came in with a 1.6 carat cushion sapphire she'd inherited from her grandmother. The CAD took about five hours across two evenings. The approvals took three weeks. She changed the shoulder detail twice, then changed it back, then asked for milgrain, then took it off, then put it back on the final prong design.

What the actual timeline looks like

Here's a rough breakdown, assuming you and your jeweler communicate clearly and decisively:

• Initial consultation and stone assessment - 1 to 2 hours. This is in person or over video. I measure the stone, discuss the setting style, band width, metal choice, and general silhouette. I might sketch three quick options on paper. No CAD yet.
• First CAD model - 2 to 5 business days. This depends on complexity. A classic six-prong solitaire with a plain band? That's a quick model. A trellis setting with a hidden halo, melee on the shoulder, and a cathedral profile? That's three rounds of refinement before the first render sees the client.
• First render review and feedback - 2 to 7 days. This is the part clients underestimate. You get a photo-realistic render. You look at it. You realize you wanted a slightly taller profile. Or a softer taper. Or that you hate the way the prongs land on the stone. All normal. All part of the process.
• Revisions - 2 to 5 business days per round. I've done two-round revisions. I've done seven. Average is three. Each round requires me to open the file, adjust, re-render, and send.
• Final CAD approval - the moment everyone stops emailing and says "yes, that's the ring." Then the file goes to production - wax printing, casting, setting, finishing. That's another three to six weeks depending on the shop.

The difference between CAD and "CAD"

Not all CAD is the same. A jeweler who opens a library file - a pre-made solitaire head, a pre-made band - and tweaks the stone size and shank length is not designing. They're assembling. That takes an hour. And it's fine for a simple reset. But if you're paying for a custom ring, you want someone who models from scratch: carving the profile, matching the taper to the stone's proportions, placing each prong where it actually needs to go for that specific stone.

I use MatrixGold for the heavy lifting. It's not fast. It's not meant to be. It's precise. A good CAD designer can spend an hour just getting the inside of the band shank radius right so the ring sits flush against a wedding band.

What slows things down

• Odd-shaped stones. A standard round brilliant is predictable. A pear with a deep pavilion? A marquise with a wonky culet? That takes measuring, re-measuring, and adjusting the model to fit the stone's actual dimensions - not the ideal dimensions from a chart.
• Extreme band width. Anything under 1.6mm or over 4mm requires structural thinking. Thin bands need reinforcement in the CAD. Thick bands need weight calculations so you're not wearing a pipe.
• Complex setting types. Tension settings need exact compression calculations modeled into the shank. Pavé needs the grain and bead structure modeled, not just implied. Channel settings need the channel walls calculated for stone depth. All of this takes time.
• Multiple stones. Three-stone rings, side-stone bands, eternity rings - each stone gets its own seat in the model. That's not duplication; that's individual fitment.
• The client who changes their mind on the fourth round. It happens. I charge for it after the third revision.

Should you expect a wax model too?

Some jewelers skip the wax and go straight from CAD to casting. I don't. After the CAD is approved, I print a resin model - actual physical object, actual size - and have the client hold it. A render can lie about weight. A render can't communicate how a 2.2mm band feels on the finger versus a 2.8mm. The hands-on step catches about half of the "actually, can we make it a little thicker" conversations that would otherwise happen after the ring is cast and the metal is committed.

What to ask your jeweler

Before you commission CAD work, ask these three things:

1. "Do you model from scratch or modify templates?" - Neither answer is wrong, but you should know which you're paying for.
2. "How many revision rounds are included in your quote?" - If the answer is "unlimited," they're either inexperienced or padding the price. Most shops include two or three.
3. "Can I see the CAD file and the resin model before casting?" - If the answer is no, that's a flag.

A good CAD designer will take about a week for the first model and another week for revisions. If your jeweler quotes you three days for the whole thing, including the design work, you're not getting custom - you're getting a selection from a menu, with your name written on the order form in pen.