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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Environmental Impact of Colored Stone Mining

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Environmental Impact of Colored Stone Mining


Mining for colored stones, such as emeralds, rubies, and sapphires, can have a significant impact on the environment. The Gems & Gemology journal published an article in the Summer 2018 issue about the environmental impact of colored stone mining.

The article states that mining can cause deforestation, soil erosion, and water pollution. Areas where mining occurs can become barren and unsuitable for farming or other uses. In addition, mining can disrupt the local ecosystem and cause harm to wildlife.

The article goes on to discuss efforts to mitigate the environmental impact of colored stone mining, such as using more sustainable mining practices and re-vegetating the land once mining is complete. It also highlights the importance of consumer awareness and demand for sustainably sourced gemstones.

If you're interested in learning more about the environmental impact of colored stone mining, this article is a great resource.

Source:
Summer 2018 Gems & Gemology

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