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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Mining Diamonds in the Canadian Arctic: The Diavik Mine

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Mining Diamonds in the Canadian Arctic: The Diavik Mine


Photo by Unsplash


Photo by Unsplash

The Diavik Diamond Mine is located in the Canadian Arctic, approximately 220 kilometers south of the Arctic Circle, in a remote and pristine region of Northwest Territories. The mine is owned by Diavik Diamond Mines, a subsidiary of Rio Tinto, one of the world's largest and most diversified mining companies.

The Diavik mine was opened in 2003 and has a lifespan of approximately 16 to 22 years. It is an open-pit mine, which means that diamond-bearing ore is extracted from the ground by removing large amounts of soil and rock. The ore is then transported to a processing plant where it is crushed, screened, and sorted to extract the diamonds.

The environmental impact of the Diavik mine has been closely monitored and managed since its opening. Diavik Diamond Mines has implemented a number of measures to reduce its environmental impact, including:

  • Using wind turbines and diesel generators to generate electricity for the mine and reducing greenhouse gas emissions
  • Recycling and reusing water to reduce the amount of water taken from nearby lakes and rivers
  • Re-vegetating the land after mining is complete to restore it to its natural state and support local wildlife
  • Minimizing the amount of waste produced and safely disposing of any waste that is generated

The Diavik mine is an important contributor to the local economy and has provided employment and economic benefits to the region. However, it is important to balance economic benefits with environmental considerations to ensure that mining is done in a sustainable and responsible way.

For more study please visit the following link https://www.gia.edu/doc/Summer-2016-Gems-Gemology-v5.pdf

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Location: United States

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