| http://www.w3.org/ns/prov#value | - In particular, any one or more of single-crystal sapphire layers 50A-50D may include one or more iron, titanium, chromium, copper, magnesium or other metal components, dopants, or impurities, in order to provide a desired tint or color cast, such as red, orange, yellow, green, blue, violet or purple, or a combination thereof.
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