Gemstone Windows and Dark Patches: What to Look for in a Cut Gem

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AI-generated educational illustration. Conceptual only; not a photograph of an actual specimen or location. A coloured gem may have a pale, see-through centre or areas that look almost black. Both affect its appearance, but they do not have the same cause. What is a window? A window is an area where light passes through the gem instead of being returned towards the viewer. You may see the background through it, especially near the centre. Cutting angles and the material's refractive index—how it bends light—help determine whether this happens. There is no single ideal depth for every gemstone. Why dark patches need a closer look Darkness can have several causes. The material may absorb a lot of light. Some facets may reflect dark surroundings or the observer. Extinction is another cause, involving light that is not returned to the viewer after internal reflection. For that reason, calling every black patch “extinction” can be misleading. A simple viewing routine Look at the gem fac...
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Dyed Quartz bangle sold as natural imperial jadeite jade

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Those gems materials which have pores surface or having surface reaching craks are introduction of colouring material into a gemstone to give it a new colour, intensify present colour or improve colour uniformity. For example Agate, carnelian, chalcedony, coral, ivory, jade, opal, pearl, quartz, turquoise etc.

The Quartz bangles which are shown below in picture is colored to make imitation of imperial Jadeite Jade and also sold in the name imperial Jadeite Jade in Market.  

For more information of treatment and  detectation of treatment please visit the following  link

Detection: Magnification (concentrations of dye visible in veins and cracks), Spectroscope (Broad absorption bands due to chromium slats used as a dye), Most organic dyes will stain a swab moistened with acetone.

a close up of a person holding a banana
                                       Dyed  pores quartz bangle sold as a natural Jadeite Jade
Dyed Quartz bangles
Dyed  pores quartz under microscope

Dyed Quartz bangles
Dyed  pores quartz bangle under microscope
Kindly visit my eBay store:  https://www.ebay.com/usr/lavish_gems
                  
Location: Peshawar, Khyber Pakhtunkhwa, Pakistan

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