Gemstones Guide to Precious & Semi Precious Stones – Tagged "Cleaning Guide"
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Tourmaline Care and Cleaning Guide

Tourmaline Care and Cleaning Guide

Tourmaline ranks 7 to 7.5 on the Mohs hardness scale.   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, diamond is only one number away, but it’s many times harder...

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