Ostentatious Oval Faceting Diagram: Comprehensive Precision Gem Cutting Guide
Crafting a truly mesmerizing gemstone requires an intricate balance of geometrical precision and meticulous angle planning. Among the various fancy cuts available to lapidary artists, oval-shaped designs hold a timeless appeal due to their elegant elongation and exceptional light return. The Ostentatious Oval, masterfully engineered by designer Arya Akhavan as part of his celebrated Faceting 101 series (Lesson 8), represents a brilliant intersection of complex facet structuring and high scintillation. Featuring a substantial configuration of 95 total facets, this pattern challenges the cutter to achieve flawless meet points while rewarding them with a breathtaking finished gem. In this comprehensive guide, we will explore the complete technical specifications, step-by-step cutting sequences, professional lapidary tips, and essential FAQs to help you master this extraordinary pattern.
Recommended Related Guides on Horizon Gems:
- Looking for a high-facet geometric challenge? Check out our detailed guide on the Fantastick_80 Faceting Diagram.
- Explore more precision cutting techniques and design breakdowns in our main Horizon Gems Library.
1. Understanding the Ostentatious Oval & Material Suitability
The Ostentatious Oval is purposefully designed to maximize light dispersion and brilliance across an elongated oval footprint. Calculated specifically around a baseline Refractive Index (R.I.) of 1.610, it serves as an ideal choice for beryl family stones such as aquamarine and emerald, as well as tourmalines and other medium-to-high R.I. rough materials.
The architecture relies on a 2-fold mirror-image symmetry incorporating 79 pavilion and girdle facets alongside 16 crown elements. This dense distribution of facets captures ambient light from multiple angles, creating a vibrant, lively crown appearance that effectively conceals minor inclusions while highlighting the core color intensity of the rough gemstone.
2. Technical Design Specifications
- Design Name: Ostentatious Oval (Faceting 101 - Lesson 8)
- Designer: Arya Akhavan (November 2012)
- Required Index Gear: Standard 96 Index Gear
- Optimized Refractive Index (RI): 1.610
- Total Facet Count: 79 Pavilion + 16 Girdles = 95 Total Facets
- Symmetry Type: 2-fold, mirror-image symmetry
- Length-to-Width Ratio (L/W): 1.203
- Table-to-Width Ratio (T/W): 0.394
- U-to-Width Ratio (U/W): 0.351
- Pavilion Depth Ratio (P/W): 0.525
- Crown Height Ratio (C/W): 0.239
- Estimated Volume Ratio (Vol./W³): 0.329
3. Step-by-Step Cutting Instructions & Angle Sequences
Successful execution of this pattern requires strict adherence to the sequential order for both pavilion and crown stages on a 96-index gear machine.
PAVILION CUTTING SEQUENCE
| Facet | Angle | Index Settings (96 Index) | Instruction |
|---|---|---|---|
| P1 | 42.02° | 03-09-15-21-27-33-39-45-51-57-63-69-75-81-87-93 | Cut to centerpoint |
| G1 | 90.00° | 21-27-69-75 | Set stone width |
| G2 | 90.00° | 12-36-60-84 | Meet P1, G1 (continue false girdle) |
| G3 | 90.00° | 06-42-54-90 | Meet P1, G2 (continue false girdle) |
| G4 | 90.00° | 02-46-50-94 | Meet P1, G3 (continue false girdle) |
| P2 | 65.02° | 12-36-60-84 | Level girdle |
| P3 | 66.71° | 06-42-54-90 | Level girdle |
| P4 | 67.42° | 02-46-50-94 | Level girdle |
| P5 | 41.02° | 06-12-18-30-36-42-54-60-66-78-84-90 | Meet P1, P3, P4 (only 4 facets meet) |
CROWN CUTTING SEQUENCE
| Facet | Angle | Index Settings (96 Index) | Instruction |
|---|---|---|---|
| C1 | 42.08° | 02-46-50-94 | Set girdle width |
| C2 | 42.08° | 06-42-54-90 | Level girdle |
| C3 | 47.09° | 12-36-60-84 | Level girdle |
| C4 | 52.05° | 21-27-69-75 | Level girdle |
| C5 | 42.08° | 24-72 | Meet G1, C4 |
| C6 | 42.18° | 15-33-63-81 | Meet G1, G2, C3, C4 |
| C7 | 36.99° | 04-44-52-92 | Meet G3, G4, C1, C2, C3, C6 |
| C8 | 33.46° | 03-45-51-93 | Meet C1, C7 |
| C9 | 25.00° | 21-27-69-75 | Meet C2, C3, C6; C4, C5, C6 |
| C10 | 24.55° | 07-41-55-89 | Meet C2, C3, C6, C7, C9 |
| T | 0.00° | Table | Meet C8, C10 |
4. Expert Lapidary Tips for Cutting Ostentatious Oval
- Oval Alignment & Doping: Ensuring the rough gemstone is precisely aligned along its major and minor axes on the dop stick is critical for maintaining the targeted Length-to-Width ratio of 1.203 without asymmetry.
- Managing False Girdles: Pay extreme attention when cutting and maintaining false girdles (G2, G3, and G4) to ensure smooth transition planes and clean meet points with the primary pavilion centerpoint.
- Refractive Index 1.610 Optimization: Although tailored for stones with a 1.610 R.I. such as beryl and tourmaline, keeping your laps meticulously clean and properly lubricated will guarantee a pristine mirror finish across all 95 individual facets.
5. Frequently Asked Questions (FAQs)
Q1: What specific index gear is required to cut the Ostentatious Oval design?
A: This intricate pattern is custom-calculated specifically for a standard 96-index gear wheel to properly distribute its 2-fold symmetry and facet arrays.
Q2: Who is the original creator of this specific pattern?
A: The Ostentatious Oval was meticulously created by master lapidary designer Arya Akhavan in November 2012 as Lesson 8 of his widely popular Faceting 101 educational series.
Q3: How many total facets does this oval design feature?
A: The design incorporates a high-density arrangement of 95 total facets, which includes 79 pavilion and girdle elements along with 16 crown facets culminating in the table.
Q4: Which gemstone materials work best with an R.I. of 1.610?
A: Materials with a refractive index around 1.610, such as beryl (aquamarine, emerald) and tourmaline, yield optimal light performance and brilliance under this specific angular configuration.
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