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| There are a lot of advantages for using diamonds and sapphire, which is the hardest substance as industrial jewel parts. Please compare with other materials using following Physical Properties Chart.
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Diamond |
Sapphire |
Quartz |
General Glass |
General Zirconia |
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New Mohs Hardness |
15 |
12 |
9 |
5.5～6.5 |
7 |
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Knoop Hardness |
4,890～5,180 |
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480～550 |
510～540 |
1,160 |
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Density |
3.5 |
3.97 |
2.2 |
2.5 |
6.0 |
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Melting Point °C |
Does not melt |
2,030～ |
1,600 |
590～780 |
2,677 |
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Thermal Conductivity cal/s-m-k cal/s-m-k sec40℃ |
0.33 |
0.0016～0.0034 |
0.01～0.03 |
- |
- |
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Thermal Conductivity Coefficient 10-7/k |
9.0～11.8 |
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80 |
~100 |
80 |
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Coefficient of |
No measured value Extremely small |
For high carbon steel 0.14 |
For high carbon steel 0.80 |
- ~0.7 |
- ~0.3 |
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Refractive Index |
2.439 |
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1.55 |
Varies depending on the material |
- |
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Compression |
0.14～0.18 |
0.317 |
2.62 |
- |
- |
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Coefficient of Elasticity 10-6kg/cm2 |
9.0 |
5.0 |
0.76 |
0.5～0.8 |
- |
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Crystal |
Cubic |
Hexagonal Crystal |
Hexagonal Crystal |
− |
− |
