Physical and chemical properties of gems and jades Mechanical properties Optical properties Chemical properties Other properties
- Mechanical properties
Cleavage: The property of splitting into smooth planes along the crystal direction.
Fracture surface: random random and irregular fracture Hardness: degree of abrasion resistance
Brittleness: degree of impact resistance
Note: Hardness and brittleness are the best scientific evidence to explain that diamonds are hard but afraid of collision.
Density: mass per unit volume
Hardness test stone: talc gypsum calcite fluorite apatite orthoclase quartz topaz corundum diamond 12345678910
Others: nail: 2.5~3 copper needle: 3 glass: 5~6 blade: 5~6 steel file: 6~7
- Optical properties
Color: the visual effect of visible light entering the human eye.
Transparency: The degree to which an object allows visible light to pass through. Transparent Translucent Opaque
Gloss: The ability of a gem's surface to reflect light. Metallic luster Diamond luster Glass luster Grease luster Waxy luster Pearl luster Silk luster
- Special lighting effects
Starlight effect Cat eye effect Coloring effect Daylight effect Moonlight effect Chemical properties and other properties
Luminescence: The property of emitting visible light under the excitation of external energy. Such as fluorite
Corrosion resistance: the ability to resist external corrosion. For example, diamonds are not afraid of ordinary acids and alkalis.
Conductivity: gemstones generally have little conductivity, while organic gemstones have electrostatic effect.
Thermal conductivity: Diamonds have the best thermal conductivity among gemstones known in nature.
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