CAD
Computer aided design, or CAD, is software used to build precise 3D models of jewellery before any metal is cut or cast.
CAD is how a modern workshop draws a piece of jewellery in three dimensions before a single gram of gold is touched. A designer works in software such as Rhino, Matrix or ZBrush, building the shank, head, gallery and stone seats as exact solids, then hands that file to rendering, to the customer for approval, and on to production. Getting the geometry right on screen is far cheaper than fixing it in metal.
What a jeweller actually builds in CAD
A CAD model is not a sketch. Every prong, every bearing that a stone sits in, every wall thickness and finger size is a real measurement, so the file carries the information a caster and setter need rather than just a picture of the finished look.
Designers usually start from a stone list. The software places each diamond at its true diameter, cuts the seats, and warns when metal is too thin to cast or when two prongs would collide. That constraint checking is the quiet value of CAD: the piece is proven buildable before anyone commits material.
- Parametric shanks and heads that resize without redrawing the whole piece
- Accurate stone seats sized to real diamond and melee dimensions
- Wall thickness and prong checks that flag casting problems early
- A clean file that feeds rendering, CAM and the bill of materials
Where CAD sits in the production line
CAD is the hinge between design and manufacture. Once a model is approved it drives photorealistic rendering for customer sign off, then exports to CAM, where a mill or resin printer produces the master used for casting.
Because the same file feeds pricing and the component list, a change made in CAD, say switching a centre stone from 0.7 to 1.0 carats, can ripple through to the render, the wax, the metal weight and the quoted price without anyone re-entering the numbers by hand.
Why it cuts waste and rework
The expensive mistakes in fine jewellery happen in metal: a head that will not hold the stone, a band that casts porous, a ring a full size off. CAD moves those decisions to the screen, where a revision costs minutes, not a fresh casting.
It also makes bespoke work repeatable. A saved model can be reproduced or lightly modified years later for a repair, a matching band or a second piece in a set, which hand carving alone never guaranteed.
- CAD builds jewellery as exact 3D geometry, not just a drawing
- Stone seats, wall thickness and prongs are checked before casting
- The same model feeds rendering, CAM, costing and the BOM
- Revisions on screen are far cheaper than fixing cast metal
- Saved files make custom pieces repeatable for repairs and sets
CAD, in short.
Which software do jewellers use for CAD?
Rhino with the Matrix or MatrixGold plugins is common, alongside RhinoGold, ZBrush for organic forms and CounterSketch for guided ring design. The choice depends on whether the work is more technical or more sculptural.
Is CAD the same as 3D rendering?
No. CAD builds the model's geometry and engineering, while rendering turns that model into a photorealistic image. Rendering happens after the CAD model is finished and uses it as the source.
Does CAD replace hand craftsmanship?
It replaces the drafting and mastering stage, not the bench. Casting, stone setting, polishing and finishing are still done by hand, and many designers still carve wax for pieces where a hand feel matters.
Can a customer see the CAD design before buying?
Usually through a render rather than the raw file. The CAD model is converted into a lifelike image or a turntable view so the customer can approve the exact piece before it goes into production.
Related terms
See cad inside a real jewellery system.
JewelleryOS keeps product, pricing, stones and orders in one connected place, built for how jewellery businesses actually work.