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The properties of synthetic ruby

Synthetic rubies have a number of properties that make them useful for a variety of industrial and scientific applications.


Synthetic rubies are exceptionally hard, measuring 9 on the Mohs scale of mineral hardness. This hardness is only exceeded by that of diamonds, which makes synthetic rubies very resistant to scratches and abrasion.

Chemical composition

Rubies are generally composed of aluminum oxide (Al2O3), also known as corundum.

The presence of trace elements such as chromium, titanium and iron can give synthetic rubies different colors, ranging from red to pink and violet.


Synthetic rubies are generally transparent or translucent, depending on their quality and the way they are cut and polished.

High-quality synthetic rubies can have excellent clarity and transparency, allowing light to pass through with minimal distortion.

Optical properties

Ruby has favorable optical properties, including a high refractive index and birefringence. These properties contribute to its brilliance and sparkle when correctly cut and faceted.

Thermal stability

Synthetic rubies have good thermal stability and can withstand high temperatures without suffering significant changes to their physical or optical properties.

This property makes them suitable for use in high-temperature applications such as laser technology.

Electrical insulation

They are insulating materials, which means that they do not conduct electricity.

This property makes them useful for applications that require electrical insulation, such as in certain electronic and mechanical devices.

Overall, the combination of hardness, color, transparency, optical properties and thermal stability makes this material valuable for a wide range of industrial, scientific and decorative applications.