Designed by Arya Akhavan (November 2012) as part of the Faceting 121 - Lesson 1A series, Beave is a fundamental octagon gem cutting design crafted to explore faceting theory and light reflection patterns.
Targeted for Quartz-family gemstones with a Refractive Index of R.I. = 1.540, this 25-facet design features an 8-fold mirror-image symmetry. It serves as an ideal introductory project for beginners to learn reflection patterns, light return dynamics, and color matching—especially when working with dark amethyst rough.
Design Specifications
| Parameter | Specification Details |
|---|---|
| Design Name | Beave (Faceting 121 - Lesson 1A) |
| Author | Arya Akhavan (Nov 2012) |
| Target RI | R.I. = 1.540 (Quartz, Amethyst, Citrine) |
| Facet Count | 17 + 8 girdles = 25 total facets |
| Symmetry / Index | 8-fold, mirror-image symmetry | 96 Index Gear |
| Proportions | L/W=1.000 | T/W=0.414 | U/W=0.414 P/W=0.450 | C/W=0.205 |
| Volume Ratio | Vol./W³ = 0.234 |
Step-by-Step Cutting Angles
1. Pavilion Cutting Sequence
| Facet | Angle | 96-Index Settings | Instruction / Meet Point |
|---|---|---|---|
| P1 | 42.00° | 96-12-24-36-48-60-72-84 | Cut to centerpoint. |
| G1 | 90.00° | 96-12-24-36-48-60-72-84 | Set stone size. |
2. Crown Cutting Sequence
| Facet | Angle | 96-Index Settings | Instruction / Meet Point |
|---|---|---|---|
| C1 | 35.00° | 96-24-48-72 | Set girdle width. |
| C2 | 44.72° | 12-36-60-84 | Level girdle. |
| T | 0.00° | Table | Meet C1, C2 |
Lesson Insights & Materials
The primary focus of this lesson is observing how reflection patterns change with varying facet complexity and RI levels.
- Dark Amethyst / Quartz (RI 1.54): Recommended material for this lesson to match color and light patterns with Lesson 1B and 1C.
- Simple Geometry: With only 25 total facets, it provides an easy cut with clean symmetry and straightforward meet points.
Explore more custom faceting diagrams and precision lapidary guides on Horizon Gems!
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