>Gemstone Hardness
December 29th, 2009 by admin>About The Measurement SystemGemstone hardness is measured on the Mohs scale. This is a relative scale so you can understand which gems are harder than others. The Mohs scale is not proportional. For example, a gemstone with hardness of 6 is not twice as hard as one that is hardness 3. However, you can tell [...]