Sapphire glass, typically referring to synthetic sapphire, whose core component is aluminium oxide (Al2O3), exhibits significant similarity to natural sapphire in terms of chemical composition and physical properties. Nevertheless, a fundamental distinction between the two things is apparent in the discrepancy of their formation processes and internal microstructures. From the perspective of composition alone, it can be considered that sapphire glass is essentially a form of sapphire.

Sapphire glass, particularly utilized in consumer products with transparent components, such as watch glass and mobile phone screens, typically exhibits a requirement for high light transmittance. It has been demonstrated that an increase in transparency is directly correlated with an enhancement in screen display clarity and an improvement in visual experience. Concurrently, this enhancement can lead to a reduction in device power consumption and an improvement in battery life.

Although the public primarily associates sapphires with blue gemstones, in reality, natural sapphires exhibit a diverse spectrum of colors, including transparent ones. Its color development characteristics are mainly affected by the content of impurity elements (such as iron, titanium, etc.), so natural sapphires with different contents of impurity elements will present different colors.

Furthermore, sapphire glass is relatively heavy, and if temperature control and cutting techniques are not properly managed during the production process, it may crack. It should be noted that the use of sapphire glass is not exclusive to high-end watches; many counterfeits also utilize this material. 

It is important to note that sapphire glass is not a traditional glass material. Strictly defined, the primary structure of artificial sapphire is crystalline alumina. Glass is typically characterized as “an amorphous solid with no fixed melting point and a long-range disordered internal structure”. This means that, strictly speaking, sapphire glass cannot be classified as glass.