Notizie di gioielli

cz silver jewelry wholesale How does the color of gems come from? (SU)

Pubblicato il da Kingjy

The reason why gems are called “treasures” is their beautiful color. So what is the attractive color of gems? Where did it come from?

Color is an electromagnetic wave that can be felt by the human eye with a certain wavelength. Its wavelength range is about 400-700 nm in the electromagnetic spectrum, also known as the visible spectrum. In the visible spectrum, light of different wavelengths presents different colors. The wavelength of each single color is: red light has a wavelength of 630-700 nm; orange light has a wavelength of 590-630 nrn; yellow light has a wavelength of 550-590 nm; The wavelength of green light is 510nm～550 nm; the wavelength of cyan light is 480～510nm; the wavelength of blue light is 450～480 nm; the wavelength of purple light is 400～450 nm. The mixed color composed of these colors is white light, such as sunlight, incandescent light, ecc.

The color of a gem is the same as other objects. When the light hits the gem, the gem’s absorption, transmission and reflection of different wavelengths of visible light produce different visual results. Per esempio, the red color of ruby ​​is when white light passes through ruby, most of the visible light waves are absorbed, only red light and part of yellow light are transmitted, and the residual color is red hue. When a gem absorbs all white light, the gem reflects black, such as smoky quartz and black agate. When all white light passes through the gemstone (no absorption), the gemstone is colorless, such as colorless crystals and colorless diamonds. It can be seen that different gems can show different colors under the same white light. This effect that affects the movement of light and causes it to produce different colors is caused by the different degrees of absorption of light by the characteristic chemical composition and structure of the gem. In generale, one of the important reasons is that the gem contains a small amount of metal ions. Cause.

To judge the color of a gem, it is best to observe the surface with reflected light against a white background. A light source with a continuous spectrum, such as sunlight or its equivalent, should be selected.

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