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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Ban of Russian origin rough diamond and its effects on world diamond supply chain

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 Effect of the ban on rough diamond supply chain 

The G7 ban on Russian origin rough diamonds has had a significant impact on the world diamond supply chain. This ban was implemented in response to Russia's involvement in destabilizing activities globally.
With the ban in place, countries that heavily relied on Russian rough diamonds for their diamond manufacturing and trading operations have been forced to find alternative sources. This has disrupted the supply chain and caused a shortage of rough diamonds in the market.
As a result, diamond prices have increased, and some diamond manufacturers and traders have faced challenges in meeting customer demands. The ban has also led to a decline in diamond exports from Russia, impacting its economy.
However, this ban has also created opportunities for other diamond-producing countries to fill the gap left by Russian rough diamonds. Countries like Botswana, South Africa, and Canada have seen an increase in their diamond exports as they become alternative sources for rough diamonds.
In the long run, the G7 ban on Russian origin rough diamonds is expected to reshape the global diamond supply chain and encourage diversification in sourcing rough diamonds. It highlights the importance of sustainable and responsible diamond mining practices.

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