What is the difference between Mineral Crystal and Sapphire Crystal?
You cannot tell the difference between regular mineral crystal and sapphire crystal, except when you attempt a scratch test. Mineral crystal is break resistant but scratches relatively easily; whereas sapphire crystal measures very high at 9 on the Mohs scale, a rating measure of the relative hardness of various materials. Watches are often marked as scratch resistant when fitted with sapphire crystal. Very often, lines and marks on sapphire crystal are mistaken for scratches, which is actually the anti-glare coating fading off after time.
