How to Specify Calibrated Rubies for a Jewelry Collection

“Calibrated” should mean more than choosing a nominal size from a dropdown. For jewelry production, the acceptable dimensional range must reflect the setting and assembly process.

Start with the setting drawing

Provide the seat dimensions, setting type and critical clearances. If the design already exists, measure several successful stones rather than relying on a single nominal label.

List the dimensions that matter

Length and width control face-up fit, while depth influences seating and finished profile. Depending on the cut, girdle thickness, corner geometry and pavilion angle may also matter.

Separate size tolerance from visual matching

Two stones can fall within the same dimensional tolerance but look different because of outline, facet pattern or color. Earrings and multi-stone layouts need both dimensional and visual matching criteria.

Approve a representative sample

Fit the sample in the real setting, inspect it under relevant lighting and record any adjustment. A production sample is more useful than an isolated beauty photograph.

Document the approved range

Keep the drawing revision, measured sample, color reference and approval date together. For repeat orders, identify whether the previous sample remains the master reference.