why do some watches say quartz on the face ?

Answer:

Yes, however the coloured varieties such as amethyst, citrine and rose quartz also contain minute quantities of various impurities which cause the colour.

Where can I find granite quartz?
WATCHES : Automatic , Quartz, Manual-winding, what's your favorite ??
Calcite, Corundum, Feldspar, Fluorite, Galena, Gypsum, Halite, Hematite, Magnetite, Olivine, Pyrite, Quartz ?
Will you pay to see the largest cluster of quartz crystals in natural form?
What were some ancient uses for white quartz?

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why do some watches say quartz on the face ?

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