---
title: Verneuil Sapphire | Freudiger SA
description: Discover Verneuil Sapphire, a synthetic sapphire offering exceptional durability and optical clarity, ideal for industrial and luxury applications.
image: https://freudigersa.com/hubfs/Featured%20Image.jpg
---

# Verneuil Sapphire

[Download technical sheet](https://freudigersa.com/hubfs/Schede%20tecniche/VERNEUIL.pdf?hsLang=en)

[Require your custom solution](https://freudigersa.com/materials/verneuil-sapphire#contact-us)

## What is Verneuil Sapphire

The Verneuil sapphire is a synthetic sapphire created using the innovative Verneuil method (also called flame-fusion). Chemically identical to natural sapphire (Al₂O₃), it combines exceptional durability, optical clarity, and customizable color. Thanks to its efficiency and affordability, it has become a key material for both industrial and luxury applications.

## Technical informations

| Growth Process |  |
| --- | --- |
| Flame fusion melting |  |
| Boules are typically small (<100mm) |  |
| Chemical Composition |  |
| Minimum 99.99% Al2O3 (Aluminum oxide) |  |
| Verneuil Sapphire is chemically identical to natural Sapphire, consisting of pure aluminum oxide with minimal impurities |  |
| Physical Properties |  |
| Crystal structure | Hexagonal rhombohedral single crystal |
| Hardness | 9 on the Mohs scale, only second to diamond |
| Density | Approximately 3.99 g/cm³ |
| Optical Properties |  |
| Clarity | Often has fewer inclusions compared to natural Sapphire, but can have curved striae (growth lines) that are characteristic of the Verneuil process |
| Refractive Index | 1.762 – 1.770 |
| Birefringence | 0.008 – 0.011 |
| Fluorescence | May fluoresce under ultraviolet light, depending on the impurities |
| Transmission range | 0.15 to 5.5 micron (from UV to mid-IR) |
| Mechanical Properties |  |
| Comparison | Similar to Kyropoulos, although less expensive |
| Annealing | Annealing is necessary to reduce internal stress |
| Thermal Properties |  |
| Melting Point | Around 2,050°C |
| Thermal Conductivity | 25 W/mK at 300K |
| Market Value |  |
| Verneuil is faster and more affordable than other sapphire growth methods |  |
| Allows color variation adding dopant elements |  |

## Verneuil Sapphire applications

**

#### Industrial Applications

Verneuil Sapphire is used in various industrial applications, including watch faces, scientific instruments, and semiconductors, due to its hardness and thermal stability.

**

#### Jewelry

Verneuil Sapphire is often used as a gemstone in rings, necklaces, and other jewelry due to its durability and variety of colors.

[Download technical sheet](https://freudigersa.com/hubfs/VERNEUIL.pdf?hsLang=en)

## The Verneuil method: how it works

Developed by Auguste Verneuil in 1902, the Verneuil method was the first commercially viable way to grow synthetic sapphire. It marked a turning point in materials science, making sapphire accessible beyond rare natural sources.

The process begins with ultra-pure alumina powder, melted in an oxy-hydrogen flame. As it cools, the material crystallizes into a single-crystal “boule.” This Verneuil sapphire is rated 9 on the Mohs scale for hardness and is virtually indistinguishable from natural sapphire, except for its controlled growth lines.

### FAQ

What is Verneuil sapphire?** It is a synthetic sapphire produced through the flame-fusion (Verneuil) process, chemically identical to natural sapphire (Al₂O₃) and with the same hardness of 9 on the Mohs scale.

How is Verneuil sapphire produced?** Ultra-pure alumina powder is melted in an oxy-hydrogen flame and crystallizes into a single-crystal boule. This method allows rapid and cost-effective growth of sapphire.

Can you manufacture custom geometries or micro-components?** Yes, we produce both standard and fully customized Sapphire components, including complex shapes and micro-parts with tight tolerances, tailored to your specifications.

Do you provide prototypes?** Yes, we support the development of prototypes and pre-series batches, allowing you to test performance and functionality before moving into full-scale production.

Is there a minimum order quantity?** No, we handle both single custom parts and large production runs. Our process is designed to meet your volume requirements without compromising on quality or precision.

Do you ship internationally?** Yes, we serve clients worldwide and manage international logistics, ensuring smooth delivery regardless of your location.

### Want more information about our Verneuil sapphire? We can also design a custom solution tailored to your application.

We are proud of our products and different material properties. We will be happy to answer your technical and detailed questions about our Verneuil Sapphire. 

*****The technical specifications and material information provided on this website adhere to industry standards and are not determined by our company. While we strive to ensure accuracy, these details are for informational purposes only and may be subject to change.

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