Quartz, a hard durable mineral, produces fine gemstones in an extensive range of colours. Here are some examples and the related healing properties of each:

Citrine - ranges yellow through orange, associated with success and prosperity

Rainbow - vivid, multi-coloured, associated with forgiveness and transformation
Jasper - red hues, associated with nuturing and relaxation
Blue - ranges from grey to blue hues, associated with love and healing
Amethyst - purple hues, associated with calm and balance
Smoky - grey hues, associated with positivity and protection
Peach - peach tones, associated with energy and creativity