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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What is Gemology and gemologist and career prospects in gemology?

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Gemology is the scientific study of gemstones. It is concerned with the study of gem materials, including identification, testing methods and the basic knowledge of crystallographic, chemical, physical and optical properties of the gemstones.

What is a Gemologist?

A gemologist is someone who can identify the gemstone with the help of Instruments. Gemologists give a business added credibility.

Career prospects in Gemology: Following are the career prospects for a Gemologist:

  • Entrepreneurship in Gemstone dealing (the semi precious varieties do not cost a great deal!)
  • Working as a gemologist with any of the renowned jewelers.
  • Working or setting up your own laboratory for gem testing or gem identification.
  • Pursuing further research in gemology or diamond grading.
  • Creating your own designs in traditional or modern jewelry.
  • Working as jewelry designers in fashion institutes.
  • If you are a geologist you can focus your doctorate or post doctorate studies on diamonds or gemstones.
  • Start with a lab setup for creating synthetic gems.
  • Dealing in organic gems like corals and pearls is a different business avenue in itself.


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