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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Platinum and Jewelry Information

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Platinum and Jewelry Information

Here are some facts about platinum and jewelry:

Platinum Image
Platinum

Platinum is a chemical element with the symbol Pt and atomic number 78. It is a dense, malleable, ductile, highly unreactive, precious, silverish-white transition metal. Platinum is used in jewelry, laboratory equipment, electrical contacts, dentistry, and automobile emissions control devices.

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Jewelry

Jewelry consists of decorative items worn for personal adornment, such as brooches, rings, necklaces, earrings, pendants, bracelets, and cufflinks. Jewelry may be attached to the body or the clothes.

Platinum Coins

Platinum coins have been used for commerce for many years. Some of the most famous platinum coins include:

  • American Platinum Eagle
  • Canadian Platinum Maple Leaf
  • Australian Platinum Koala
  • Isle of Man Noble
  • Chinese Platinum Panda
  • Russian Ballerina
  • British Platinum Britannia

Most Expensive Design of Platinum Jewelry

The most expensive design of platinum jewelry is currently the "The Winston Blue" diamond, which is set in a platinum ring and valued at $23.8 million.

Most Productive Country of Platinum

The most productive country of platinum is currently South Africa, which produced 110 metric tons of platinum in 2020.

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