...why does glycine use it? How does it compare to a sapphire crystal? I'm quite taken by the Glycine Incursore; it's a beautiful plain design and from what I hear it's a great watch. I'd like to get one. I'm concerned that it doesn't have sapphire crystal, especially for the price range its in. I'm I'm woefully ignorant of the benefits of K1 mineral glass used on the Incursore, please tell me. I'm unaware of its scratchproof/shatterproof properties.