# 💎 Cheatsheet: Beginner 3D Jewelry: Model and Render a Gemstone Ring

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A single lookup card for the whole course. Scope: Blender setup, hard-surface modeling, rings/pendants/earrings, stone setting, shaders, lighting, and final render delivery.

## Quick Reference: The Whole Workflow

```steps
1. Set up workspace: Metric + Millimeters, Unit Scale 1.0, low clip start, 0.25 mm snap.
2. Block out with primitives at real dimensions. This file is your measuring stick.
3. Model hard-surface forms: loop cuts for control, bevel for the polished radius, subdivision for smoothness.
4. Build rings, pendants, earrings from real-world numbers (ring size, bail gauge, post gauge).
5. Seat the stone: prong bearing or bezel inner seat at real scale.
6. Shade: metal (Metallic 1.0, low Roughness, tinted Base Color), gemstone (transmission, IOR, Roughness ~0).
7. Light a studio setup, render hero + detail shots, package for portfolio.
```

## Module 1: Setup and Precision Modeling

### 1.1 Workspace and Real-World Scale

| Setting | Value | Why |
| --- | --- | --- |
| Unit System | Metric | Jewelry is measured in mm |
| Length Unit | Millimeters | Matches calipers, ring sizes |
| Unit Scale | 1.0 | Keeps 1 Blender unit = 1 mm |
| Clip Start | Lowered (e.g. 0.01 mm) | Tiny prongs stay visible, no clipping |
| Snap Increment | 0.25 mm | Precise placement of small parts |

- **Golden rule:** model at real size. A 2 mm prong is 2 mm in Blender, not "small."
- Set up a **reference primitive** (1 mm cube) to sanity-check scale before modeling.
- Apply scale on any object before beveling or subdividing (`Ctrl+A` > Scale).

### 1.2 The Hard-Surface Toolkit