There are mainly six kinds: cat's eye effect, starlight effect, color-changing effect, halo effect, color-changing effect and placer gold effect.
cat's eye effect
Under the irradiation of parallel light, a bright light band will appear on the surface of some jewelry and jade cut and polished into fox shape, which moves with the rotation of the sample or light. This phenomenon is called cat's eye effect. Like opals.
Starlight effect
Under the irradiation of parallel light, two or more bright lines appear on the surface of some jewelry and jade cut and polished into fox shape, which is called starlight effect. For example, rubies and some pink crystals have the effect of six stars.
Discoloration effect
The phenomenon that the color produced by the interference or diffraction of some special structures of gemstones changes with the change of light source or observation direction. Like opal.
Halo effect
Due to the interference and diffraction of light, some light waves weaken or disappear, and some light waves strengthen, resulting in a color phenomenon called halo effect. Like the halo of Labrador.
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Under the irradiation of different visible light sources, jewelry and jade show obvious color changes. Common light sources are fluorescent lamps and incandescent lamps. Such as metamorphic rocks, sapphires and garnets.
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The scintillation phenomenon caused by the reflection of light by tiny flaky mineral inclusions in gems is called placer gold effect. Such as sunshine stone.
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