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4mm Faceted Round Natural gemstone Hardness: 6.5 - 7 on the Mohs scale Thread hole size 0.8mm Healing properties: Physical and Emotional Strength, Protecting Onyx is a variety of Chalcedony from the Quartz family, easily identifiable by its jet black colour and highly polished surface. These onyx have been treated with a dyeing process to uniform the black colour tones of the stone. Onyx has generally been known as a stone of protection and is excellent for promoting strength and improving self confidence and wise decision making. These faceted beads measure approximately 4mm in diameter with a threading hole size of 0.8mm and are supplied as a 16" strand. Please note that due to the nature of the material, each strand is unique so colours will vary and slight natural inclusions are sometimes faintly visible. Care: As with all gemstones, care must be taken. It is not advised to place onyx stones in an ultrasonic, steam cleaner or chemical cleaning solution. Onyx can be easily cleaned with a warm soapy water mix or an untreated cloth. It is advised to avoid exposing onyx to prolonged periods of heat and light.
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