ColorUp Pietersite 6mm Silver Bracelet. Pietersite is a unique variety of quartz, often referred to as the "Tempest Stone" because of its swirling, stormy patterns. Material: Silver Stone: Quartz Stone Colour: Brown,Black,Yellow Size Guide Size Small = 17cm Size Medium = 18cm Size Large = 19,5 cm Size X-Large = 21 cm Note: The measurements refer to the total length of the bracelet when laid flat. Please keep in mind that the bead sizes can vary slightly, as each bracelet is handmade and based on the given length when fully extended. Fit Recommendations: If you prefer a tight fit, measure your wrist and add 1 cm. So eg. if your wrist measures 16cm, you should go for a size 17cm For a looser fit, add 2 cm to your wrist measurement. This will help you select the best size for a comfortable and customized fit. If you are in between sizes, choose the biggest size