Opal and Tourmaline Care and Cleaning Guide
Link 1: https://www.gia.edu/opal-care-cleaning Link 2: https://www.gia.edu/tourmaline-care-cleaning Opal Hardness and toughnessGem and mineral hardness is measured on the Mohs scale. The numbers are based on the relative ease or difficulty with which one mineral can be scratched by another. But the Mohs scale is deceptive. The steps between the minerals are not evenly spaced. For example, […]
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