Hardened Mineral glass vs. Sapphire Crystal glass

Generally a mineral crystal is an ordinary glass crystal that has been heat treated or chemically treated to withstand scratches. While it is not as scratch-resistant as sapphire, it is more scratch-resistant than plastic.These crystals are sometimes preferred in the field because of their shatter-resistant qualities.

Typically in the luxury watch field, sapphire crystals are preferred. Sapphire is extremely strong and scratch resistant – making it the top choice for a fine timepiece.  

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