What gives quartz its many colors?

Impurities

Explanation:

Impurities in the crystal lattices of minerals can lead to the different colours of quartz we know. Some are amethyst, rose quartz, e. t. c

When impurities occupy the crystal position of a mineral they reflect light in a different way compared to a perfect cut.

Different varieties of colour quartz have their own specific impurities causing the colour sensations we see.