Pietersite plain rondelle beads measure approximately 5mm to 8mm diameter, have a vitreous luster showing chatoyancy, the gems are color treated to a medium to dark blackish denim blue hue with a silvery cat's eye phenomenon to each stone, the gems have good symmetry with good polish for a dark shimmering quality to these opaque rare gems which are a fine example of this South African sourced natural gemstone.