Optical glass differs from normal glass in its total purity. The absolute absence of impurities guarantees its perfect transparency and quality. For applications on watches as a spare part or first delivery.
Sapphire glass is three times more resistant to scratches and wear than mineral glass. In the hardness scale of materials, it is second only to diamonds. It is found in luxury watches and of course is the most expensive of all the spare parts for the glass of watches. It hardly scratches or breaks but in case you need to replace the sapphire crystal with a replacement at the height. On pentawatch all types and sizes.