Professional Jeweler Archive: Journey into CAD: Two-Tone Engagement Ring

March 2000

Precious Metals & Bench/Metalsmithing

Journey into CAD: Two-Tone Engagement Ring

Follow the process of creating a ring through computer-aided design

Jewelers can use computer-aided design to create exclusive lines and custom work quickly and relatively inexpensively. For $3,600 and the use of a service bureau, any jeweler can create custom designs. This covers the cost of CAD software plus four months of training. The service bureau produces designs created in CAD on a per-piece basis, which is appropriate for jewelers who design only a few exclusive lines per year to help brand their stores.

The two-tone engagement ring in this project could be made in five stone sizes, providing a distinctive look for you to promote.

by Steven Pollack

Steven Pollack is a goldsmith with 10 years of experience creating unique jewelry designs. His school, XYZ Academy, offers on-line classes in 3-D solid modeling using computer-aided design for direct production of wax models using the Sanders Model Maker-II Rapid Prototyper. Contact him at (888) 300-8031,

Two-Tone Engagement Ring

1. Stone Layout

Use your CAD software to lay out the stones and build the model around them. In this project, the round stone is 6.4mm and the triangles are 4mm point to point. The circle is 16.4mm in diameter (size 6), which is useful for gaining perspective at this early stage of the model.

2. Create a Rectangle

Create a 1.3mm x 6mm rectangle. This will become the shank.

3. Perform a Sweep

Perform a sweep operation using a centroid, creating a 1.3mm thick shank, seen here in the isometric view.

4. Taper the Ring

Taper the ring using the deform tool set in the dialog box in your CAD software.

5. New Sweep Path

Create a new sweep path and sweep object for the side stones.

6. Perform the Sweep Operation

Perform the sweep operation for the side stones. Then remove the overlap.

7. Copy the Side Setting

Copy the side setting using the mirror option to create a perfect duplicate. Extrude a center bridge and join it to the main body. Subtract the triangles from the main body to give you a preliminary guide for the seats. This will help during setting.

8. Superimpose Pegs

Superimpose two pegs inside the pieces, subtract them from the main body using the difference tool and join to the side setting element. They will act as registers so the pieces can be easily and perfectly soldered in place after casting in different metals.

Copyright © 2001 by Bond Communications