These are highly polished smokey quartz nugget beads. Each strand is gently graduated from 10 to 15mm. Smokey quartz is known as the stone of power. It provides a shield against psychic attacks, emotional and environmental stress, and is used extensively in healing and meditation. Smokey quartz was named after its smoke color, but smokey quartz can range in color from light grey to deep earthy smoke brown. These smokey quartz beads are a transparent yet rich deep smoke color.