6/13/2023 0 Comments White sapphire hardness![]() ![]() ![]() But why the choice of sapphire crystal? To find out, let’s walk the path of the evolution of Rolex together. Tuttavia, a causa della difficoltà e dei costi di lavorazione non fu ma un utilizzo sistematico fino agli anni ’70 e ’80 quando Rolex iniziò ad utilizzare questo materiale su tutti i suoi modelli. However, due to its high processing costs was never used systematically until the ’70s and ’80s when Rolex started using it on all its main models. ![]() Comparison between sapphire crystal and plexiglassĪccording to history, sapphire crystal was firstly used by Jaeger LeCoultre in the early ’30s and subsequently by Omega in the ’50s Unfortunately, however, while returning a very warm feeling much sought after by vintage lovers, this material also carries some potential issues, and did not always allow a clean and clear view of the dial. The idea that revolutionized modern watchmakingīefore the advent of sapphire glass, even large companies offered their customers dials enclosed in a plastic glass made of plexiglass preferred for its resistance, ease of molding and usability. Indeed, sapphire crystal is made up of synthetic sapphire, usually used to make the protective screen of watch dials, thanks to its hardness it can only be scratched by boron nitride or diamond. In 1902, French chemist Auguste Verneuil developed a process to manufacture synthetic sapphire crystals, which immediately found application in the field of watchmaking. ![]() Sapphires can have the most diverse colors, from pink to orange, purple, green, yellow to colorless white these variants are identified with the name of other stones, followed by the suffix “oriental”, for example the terms oriental amethyst and oriental emerald are today identified with the names of violet sapphire and green sapphire. Sapphire, from the Greek sàppheiros, “blue”, or from the Hebrew “sappir” or “the most beautiful thing”, identifies the blue-blue variety of corundum, which is chemically aluminum oxide and has a hardness equal to 9 on the scale by Mohs. ![]()
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