The hardnesses of the softest minerals are more similar than the hardnesses of the four hardest ones (quartz, topaz, corundum, diamond). Gypsum (H=2) is only slightly harder than talc (H=1), but diamond (H=10) has a hardness five times greater than corundum (H=9). Gemstone Hardness and Mohs Hardness Scale,

Friedrich Mohs developed the Mohs' hardness scale in 1822. This scale indicates the relative hardness of the different minerals start, softness - 1 to hardness – 10. Talc is the softest, and the diamond is the hardest stone. Only those below each mineral will scratch. The MOHS scale of hardness chart for gemstones

Birthstones. What are the birthstones by month? January is garnet, February is amethyst, March is aquamarine, April is diamond, May is emerald, June is alexandrite, July is ruby, August is peridot, September is sapphire, October is tourmaline, November is topaz, December is blue topaz. Learn more about these popular gemstones.

Blue Gems. Though blue is a more common gem color than red, very few gems occur in a pure saturated blue. Sapphire is really the only example, though tanzanite sometimes comes close. Other blue gems tend to be a grayish-blue (spinel, benitoite), greenish-blue ( blue zircon, apatite, tourmaline, gem silica) or a pastel blue (aquamarine, topaz).

The Mohs Hardness Scale and Chart for Select Gems. The Mohs hardness scale measures a mineral's resistance to scratching. Find the traditional scale here and a chart of select gems ordered by hardness..

Mohs' hardness is a measure of the relative hardness and resistance to scratching between minerals. Other hardness scales rely on the ability to create an 

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 

Gems are minerals that occur naturally, forming in crystalline structures, which create varying levels of strength. A German geologist, Friedrich Mohs, created 

In gemology, gem hardness is measured on a scale known as the Mohs scale, which assigns minerals a value between 1 (softest) and 10 (hardest). This scale was 

The Mohs scale of mineral hardness is a relative scale developed by Freidrich Mohs in 1812 to help classify minerals by their hardness relatives to each 

53 rows · Hardness: Gem: Hardness: Diamond: 10: Jasper: 6.5 - 7: Star Sapphire: 9: Chrysoprase: 6.5 - 7: