Mohs Scale of Hardness compares the resistance of a mineral to being scratched by ten standard reference minerals that vary in hardness. You calculate Mohs 

The Moh's (Mohs) scale of hardness is the most common method used to rank gemstones and minerals according to hardness. Devised by German 

The Mohs Scale – A List of Gemstone Hardness ; Bloodstone, 6.5 – 7 ; Onyx, 6.5 – 7 ; Moonstone, 6 – 6.5 ; Opal, 5.5 – 6.5.

Diamond is the hardest mineral on the planet rated at a ten, with moissanite coming next with a ranking of 9.25, but where do sapphires and 

Any gemstone that, is approximately the hardness of quartz (7) is said to be 7 in hardness, but if it tests between two of the minerals on the scale, it is expressed by 1/2. Thus a gemstone that tests harder than quartz but softer than topaz is said to be 7 1/2 in hardness. In addition to Mohs' scale, it is well to known that tests of relative

The hardest gemstones (diamonds, rubies and sapphires) get a rating closer to 10 on the Mohs scale, while the softer gemstones (amber, 

Dec 12,  · In gemology, a stone's hardness is gauged on a scale called the Mohs Scale, which allocates minerals a hardness rating between 1 for the softest and 10 for the hardest stones. The Mohs Scale was created in 1822, by a German mineralogist named Frederick Mohs. It characterizes hardness depending on the gem's scratch-resistance, in which a harder

The Mohs hardness scale is one method for classifying hardness, with stones rated from one (softest) to ten (hardest). Rhodonite also has a rating of 5.5-6.5 with iron content, so it’s only safe in water for short periods. Tangerine quartz also contains iron oxide, which is the reason for its lovely colour. This may fade in water, even

The Mohs Hardness Scale is used as a convenient way to help identify minerals. A mineral's hardness is a measure of its relative resistance 

Mohs hardness scale is a chart that measures how resistant a gemstone or mineral is to being scratched or damaged when exposed to general wear and tear.

One vital factor in measuring gemstone resilience is hardness. In gemology, a stone's hardness is gauged on a scale called the Mohs Scale, which