18K Yellow Gold Emerald-Cut Full Bezel Ring – Production-Ready Rhino CAD

PROJECT OVERVIEW

I require a precise, fabrication-ready 3D CAD model for a solid 18k (AU750) yellow-gold ring holding a 12.0 × 10.0 mm emerald-cut sapphire in a full bezel (no prongs).

This design is architectural Scandinavian minimalism — restrained, monolithic, and proportionally controlled.

This is NOT a signet ring.
This is NOT a tapered or sculpted shoulder design.

The model must be suitable for direct bench fabrication and small-batch production.
Accuracy and manufacturable geometry are critical.

STONE SPECIFICATIONS

Shape: Emerald Cut
Dimensions: 12.00mm (length) × 10.00mm (width)
Depth: 5.00mm (nominal)

Orientation: Standard north-south

Seat tolerance:
Maximum +0.10mm total clearance (tight seat fit required — not oversized)

Stone table to sit approximately 0.30mm below the bezel top edge.

Full perimeter girdle support required.

BEZEL SPECIFICATIONS

Type: Full bezel (no prongs)

Outer dimensions:
14.00mm length × 12.00mm width

Wall thickness:
1.00mm finished thickness

Walls must be perfectly vertical (90° to base plane).
Draft angle = 0°.
No taper.
No flare.

Top edge:
Completely flat plane
Sharp 90° outer edge
No chamfer
No bevel

Underside of bezel:
Flat base
No hollowing
No decorative sculpting

Aesthetic intent: strong, architectural “picture frame” look.

SHANK SPECIFICATIONS

Profile: Fully round cross-section

Band thickness: 2.80mm constant round profile throughout

No taper
No widening at shoulders
No signet mass
No flaring toward head

The band must remain a true cylindrical form.

Ring size: US 5.5

Interior:
Very light comfort fit acceptable
Minimum thickness integrity must be preserved

BEZEL TO SHANK CONNECTION

Bezel centred on band axis

Band may be locally flattened only where it meets the bezel

Join must be flush and clean

No reveal
No shadow line
No decorative separation

Transition must feel seamless and structural.

MANUFACTURING INTENT

Designed for hand fabrication in solid 18k gold.
Sections must be realistic and structurally sound.

No thin cosmetic surfaces.
No mesh modelling.
Model must be built using NURBS solid modelling in Rhino.

RENDERS REQUIRED

18k satin / brushed yellow gold finish
Uniform matte finish across bezel and band
No polish contrast

Views required:

• Top orthographic
• Front elevation
• Side elevation
• Isometric / 3-quarter
• Macro close-ups of:
– Bezel wall & seat
– Bezel-shank junction

Neutral lighting and soft background.

DELIVERABLES

• Native Rhino (.3dm)
• STEP (.step/.stp)
• STL (print-ready)
• High-resolution renders (≥ 3000px)
• Dimensioned technical drawing (PDF) including:

– Bezel inner & outer dimensions
– Wall thickness
– Seat depth
– Band thickness
– Section through centre
– Tolerances

• Estimated 18k gold weight based on final model

TIMELINE

Draft CAD with viewport screenshots: 2–3 days
1–2 revision rounds for minor dimensional adjustments
Final files within 4–5 days

Please include 2–3 examples of fabrication-ready bezel rings you have modelled.