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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The world’s top five diamond mining countries by volume of production

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A Brief Overview of Diamond Mining Around the World

Introduction

Diamonds, renowned for their durability and brilliance, have captivated human fascination for centuries. Beyond their use in jewelry, diamonds play a crucial role in industrial applications due to their exceptional hardness.

Origins and Early Discoveries

Believed to have formed around 900 million years ago, the first diamonds were discovered in India in the 4th century BC, marking the beginning of their storied history.

Global Diamond Production

Russia: Leading the Diamond Production

Russia stands as the world's foremost diamond producer, leveraging its vast reserves primarily located in Siberia's Yakutia region. ALROSA, a prominent mining group, spearheads Russia's diamond output, making the nation a key player in the global diamond market.

Botswana: Africa's Gem

Botswana, Africa's top diamond producer, boasts high-quality diamonds that contribute significantly to its GDP and export revenue. Mines like Orapa and Jwaneng are among the world's most productive, highlighting Botswana's pivotal role in the diamond industry.

Democratic Republic of Congo (DRC): Potential Amid Challenges

Despite political instability, DRC holds significant diamond reserves, largely tapped by artisanal miners. Efforts by entities like Miniere de Bakwange underscore DRC's potential for increased diamond production.

Australia: From Argyle to Merlin

Australia, with its renowned Argyle mine, has been a notable player in the diamond market, despite challenges such as declining deposits. The country continues to produce unique colored diamonds and high-quality white diamonds from mines like Merlin.

Canada: Rising in the North

Canada emerged as a prominent diamond producer in the late 20th century, with mines such as Ekati and Diavik leading the charge. Known for ethical mining practices, Canadian diamonds enjoy a favorable reputation among consumers.

Global Market and Trends

The diamond industry, valued at billions of dollars annually, continues to evolve, with countries like Australia seeing shifts in production due to resource depletion, while newcomers like Canada expand their footprint.

Conclusion

Diamond mining remains a dynamic industry, influenced by geological discoveries, economic factors, and ethical considerations. As global demand persists, nations across the world navigate challenges and opportunities in their pursuit of these precious stones.

 

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