Ladies who appreciate decent workmanship will be pleased with watches equipped with hard glass, which efficiently protects the dial from damage. Among this group will be sapphire glass. Made of alumina - a mineral with carbon oxide, it is characterized by extraordinary hardness and has a Mohs score of 9. Harder natural material than synthetic sapphire is only diamond. What else does sapphire glass impress with? Of course, optical clarity, which always ensures legibility, and a beautiful and luxurious appearance.