Ruby, a variety of the mineral corundum, has a hardness of 9 on the Mohs scale of mineral hardness.
9.0 Mohs Hardness scale
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Quartz has the value of 7 on the Mohs scale.
Amber is 2-3 on the mohs scale of hardness.
It is about 2.5 in the Mohs Hardness Scale.
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9 on the mohs scale
Extremely hard about 9.5 on Mohs' scale
A ruby is a form of the mineral corundum. The Mohs hardness scale lists the following from softer to harder: Talc - 1 Gypsum - 2 Calcite - 3 Fluorite - 4 Apatite - 5 Feldspar - 6 Quartz - 7 Topaz - 8 Corundum (which includes the ruby) - 9 Diamond - 10 Ruby has a Mohs hardness of 9.
On the Mohs scale, 6.5 to 7.0.