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.

Are there different type quartz watches. Is there a difference in quality?
What is the average life of a quartz watch?
can a watch be quartz movement and also solar drive? i forgot if my watch is solar drive, now it stopped,?
Why was the 1960s Ultra-Quartz movement by Longines such a great innovation?
amethyst and smokey quartz?

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why do some watches say quartz on the face ?

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