Do You Need a Wax or Resin Model Before Making a Ring?

What is a wax or resin model for a ring?

A ring model is a full-size, three-dimensional copy of your ring made before any gold or platinum is used. It is made in either wax or resin (a liquid plastic that hardens under light). You can hold it, turn it and, in most cases, slide it onto your finger. It shows the shape, height and thickness of the finished piece, but not the colour of the metal or the sparkle of the stones.

There are two quite different reasons a jeweller makes a model, and it helps to know which one you are being offered:

• Try-on model: printed in a sturdy standard resin so you can wear it and judge the design. It is never cast; it is just for you to look at.
• Casting model: printed in castable resin or castable wax, or carved by hand from jewellery wax. This is the pattern that gets turned into metal by lost-wax casting, and it is destroyed in the process.

Today most custom rings start as a CAD (computer-aided design) file, a precise 3D drawing built to fractions of a millimetre. The model is simply that file made physical. If any of these terms are new, our plain-English jewellery terms explain them, and if you are still deciding whether to go custom at all, start with custom versus ready-made rings.

Do you need a wax or resin model before making a ring?

Not always. A model is an extra check, not a compulsory step. Every cast ring passes through a wax or resin pattern at some point, but whether you personally see and approve a try-on model is a choice. The honest answer depends on how unusual the design is and how confident you are reading CAD renders (the photo-like images made from the design file).

If you are working through the custom process for the first time, our list of questions to ask before ordering a custom ring includes asking whether a try-on model is offered, what it costs and how many revisions are included. It also pays to settle choosing the centre diamond first, because the model is built around the exact measurements of the stone. Our complete engagement ring buying guide covers where the model fits in the bigger picture.

Fancy shapes are where a model earns its keep most often, because each outline needs its own seat and claw layout. Our overview of diamond shapes and their outlines shows why a pear, marquise or heart sits so differently from a round.

Wax or resin: what is the difference?

Both materials do the same job, but they behave differently in the printer, in your hand and in the kiln. Jewellery resin printers build a model in very thin layers, typically about 25–50 microns each (a micron is a thousandth of a millimetre), fine enough to show tiny claws and milgrain (rows of small metal beads along an edge).

Resin is stronger and holds a crisp edge, which makes it the usual choice for try-on models. Wax is softer, so it marks with a fingernail, but it melts and burns away with almost no residue, which some casters prefer for very fine work. Hand-carved wax is the older craft method: a jeweller shapes a block of wax by hand, often for flowing, natural shapes that are hard to draw in CAD.

People sometimes ask whether they can print their own model on a home 3D printer. A hobby printer can give a rough idea of shape, but jewellery printers work at a much finer resolution, and the castable materials need controlled burnout. It is a similar story to our page on what you can and can't make at home: the principle is simple, the precision is not.

How does a resin model become a finished ring?

Once you approve the design, the casting model goes through lost-wax casting, a method jewellers have used for thousands of years. The model is 'lost' because it is burnt away to leave a mould. In outline:

• Spruing: the model is attached by a small wax rod called a sprue to a central wax stem, often with other rings, forming a 'tree'.
• Investing: the tree goes into a steel flask filled with investment, a fine plaster-like material that sets hard around every detail.
• Burnout: the flask is heated in a kiln, typically to around 700–750°C over several hours, so the wax or resin burns away and leaves a hollow the exact shape of the ring.
• Casting: molten metal is poured or spun into the hollow. Platinum melts at about 1,770°C and needs special investment and equipment.
• Finishing: the casting is cut from the sprue, filed, sanded and polished, then the stones are set and the ring is polished again.

Metal shrinks slightly as it cools, commonly about 1–2%, and filing and polishing remove a little more. A good CAD designer builds both allowances into the file, which is why the claws on a model can look a fraction chunkier than they will on the finished ring. Our glossary entries for sprue, investment and casting go into each term in more depth.

What should you check on a resin model of a ring before casting?

This is the moment to change your mind cheaply. Once metal is cast, changing the height, width or shape usually means starting again. Take your time and check each of these:

Wedding band fit is the check people most often skip. Bring your band, or a sample of the style you plan to wear, to the fitting. With fancy shapes the wide part of the stone can push a straight band away; our guide to bands that sit flush beside a heart ring shows the contoured shapes jewellers use to close that gap.

Remember what a model cannot show. Resin is usually grey, green, red or clear, so it does not show the colour of yellow, rose or white gold, and an empty seat or a placeholder stone does not show brightness. Some jewellers set a cubic zirconia (a diamond simulant, not a diamond) in the model so you can judge proportions. To compare stone sizes properly, read the millimetre measurements in our guide on how to read diamond measurements, and if the model shows the stone looks smaller than you hoped, our page on whether to put budget into size or quality helps with that trade-off. Shape matters too: see which shapes face up largest for their weight.

How much does a ring model cost and how long does it take?

Costs vary between workshops and with how complex the design is, so treat these as broad Australian ranges rather than quotes:

The print itself only takes a few hours; most of the extra time is cleaning, curing, posting or arranging a fitting, and any revisions. A whole custom ring commonly takes about 3–6 weeks from approved design to collection, so a model adds days, not months. If your timeline is tight, for example a proposal date or an overseas trip, tell the jeweller at the start.

The model sits alongside other decisions about the centre stone. If you are choosing a lab-grown diamond for your setting, our list of what to ask a jeweller about a lab-grown centre stone covers grading reports and disclosure.

What do Australian rules mean for a custom ring, including TRS and insurance?

Approving a model is also a practical and legal milestone. Three Australian rules are worth understanding before you sign off.

Australian Consumer Law (ACL). A ring made to your design is usually not refundable just because you change your mind, so approval of the model matters. Your automatic consumer rights still apply: the ring must be of acceptable quality, match its description and be fit for any purpose you told the jeweller about. Where goods are supplied by reference to a sample or model, the ACL also expects them to match it, so keep a copy of the approved CAD file, photos of the model and any written changes.

Tourist Refund Scheme (TRS). Visitors, and Australians travelling overseas, may be able to claim back the GST when they leave Australia. Broadly, you need to spend AUD 300 or more (GST included) with one business, buy within 60 days before departure, hold the original tax invoice and carry or wear the ring through the airport. With a custom ring, timing is the catch: plan the model, revisions and making time so the ring is finished and invoiced inside that window.

Insurance. The ring is not yours to insure until it is finished and handed over, so ask who covers it while it is being made. On collection, get a written valuation for insurance, which usually states a replacement value. Many home contents policies cap unlisted jewellery at a fairly low amount per item, so check whether you need to list the ring as a specified item or take out separate jewellery cover.

For lab-grown diamond rings, it also helps to understand resale value questions for lab-grown diamonds before you insure, because replacement value and resale value are very different numbers. Day-to-day, see our notes on caring for a lab-grown diamond once it is set.

How does the model fit into a custom ring at GemTrove?

At GemTrove, a family jewellery business founded in 2008 with roots in the trade since 1984, the model is part of the design conversation. Designs are drawn in CAD, and a try-on model can be made so you can see the ring at full size before metal is cast. Raj Sood, a Graduate Gemologist (GIA), checks the stone seat against the actual diamond or gemstone, natural or lab-grown.

Before your appointment, it helps to have read up on budget, metal and setting choices, so you arrive knowing roughly what you want the model to show.

How do you approve a wax or resin model? Step by step

1. Confirm the stone first. Get the exact millimetre measurements of the centre stone from its grading report, so the seat in the model matches.
2. Review the CAD renders. Check top, side and end views, and ask for key measurements: head height, band width and band thickness.
3. Ask for a try-on model if the design is tall, detailed, unusual or must sit with a wedding band.
4. Wear it gently. Check comfort, height from the side and how it sits next to your wedding band or other rings.
5. Write down every change and ask for a revised render or model if anything moves by more than a fraction of a millimetre.
6. Approve in writing. Keep the final CAD file images and model photos with your order, then check timing for TRS and insurance before casting begins.

For a fuller pre-order list, see our full checklist of custom ring questions.