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level: Hardness

Questions and Answers List

Question	Answer
What is the name of the scale used to measure the hardness of a gemstone?	Moh's Scale
What gemstone is lowest on Moh's scale with a hardness of 1?	Talc
What gemstone is number 2 on Moh's scale?	Gypsum
What gemstone is number 3 on Moh's scale?	Calcite
What gemstone is number 4 on Moh's scale?	Fluorite
What gemstone is number 5 on Moh's scale?	Apatite
What gemstone is number 6 on Moh's scale?	Feldspar
What gemstone is number 7 on Moh's scale?	Quartz
What gemstone is number 8 on Moh's scale?	Topaz
What gemstone is number 9 on Moh's scale?	Corundum
What gemstone is the hardest at number 10 on Moh's scale?	Diamond
Hardness is tested using a steel probe or hardness pencils containing stone samples. What type of stones should NOT be tested using these methods?	Cut and Polished stones
What is the term used to describe the difference in hardness dependent on the structural direction of a crystalline gem?	Differential Hardness
What optical gem property is affected by the hardness in a cut and polished stone?	Lustre
What type of property is hardness?	Surface