Jewelry expertise(3)

Physical and chemical properties of gems and jades Mechanical properties Optical properties Chemical properties Other properties


  1. 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


  1. 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


  1. 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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