Gemstone Hardness Chart Hardness is defined as resistance to scratching and is graded between 1 (softest) and 10 (hardest) using the Mohs scale of mineral hardness. Diamond has a hardness of 10 (hardest) on this scale ,it is the hardest natural material known.

MOH"S SCALE OF HARDNESS 10 Diamond 9 Corundum 8 Topaz 7 Quartz 6 Feldspar 5 Apatite 4 Fluorite 3 Calcite 2 Gypsum 1 Talc Choosing a selection results in a full page refresh. Press the space key then arrow keys to make a selection. Opens in a new

Gemstone Hardness Scale MOHS Hardness Scale The Mohs Scale of hardness is a chart of relative hardness of various minerals and resistance to scratching between minerals. #1 is the softest mineral and #10 is the hardest mineral. It is a relative scale, not proportional, meaning that a mineral with the hardness of 10 will not be twice as hard as a 5.

The Mohs scale of mineral hardness (/ m oʊ z /) is a qualitative ordinal scale, from 1 to 10, characterizing scratch resistance of various minerals through the ability of harder material to scratch softer material.The scale was introduced in 1812 by the German geologist and mineralogist Friedrich Mohs, in his book "Versuch einer Elementar-Methode zur

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 Mohs hardness scale measures the relative hardness of gemstones, as determined by their scratch hardness (the resistance of a mineral when scratched with a pointed testing object.) The diamond is the hardest natural gemstone in the world and measures a ten on the hardness scale.

4/27 · So a gem with hardness of 7 can scratch a gem with a hardness of 6. These 10 gems are selected to represent the scale from 1 to 10 because they can easily be obtained in a highly pure form. Mohs scale of hardness and the corresponding minerals Talc 1 Gypsum 2 Calcite 3 Fluorite 4 Apatite 5 Feldspar 6 Quartz 7 Topaz 8 Corundum 9 Diamond 10

Mohs hardness scale, with a lot of minerals reviewed. I searched a while to find a comprehensive list of Mineral hardness and this is the best I could 

1/4 · Minerals with a Mohs hardness of 1 to 2 are considered soft, minerals from 3 to 5 are medium-hard, while those minerals with a hardness of 6 or more are hard. Minerals with a Mohs hardness of 7 or more are very hard and this is usually considered to be the minimum hardness to define a gemstone.

9/25 · Developed by the German geologist Friedrich Mohs it is currently the most commonly used scale of hardness. It is based on whether a mineral can scratch another mineral, if it can it means it has a higher hardness. If it can’t it means it has a lower hardness. If you repeat this for many different minerals you can form a list.

Crystals Minerals · Updated Mohs Hardness Scale. Diamond is now listed as the 3rd Hardest Substance known to man. JPG from PDF file from www.sedonagemandmineral.