These beads are 8 to 12mm average size. These are a beautiful deep rich smokey with unusual shapes and varying sizes per strand. Nice! 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.