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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Naphrite Jade Details

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Nephrite Jade


Nephrite jade is a type of jade that is found in many parts of the world, including China, New Zealand, Pakistan and Canada. It is an ornamental stone that is prized for its beauty and durability. Nephrite jade is often used in jewelry, carvings, and other decorative objects.

Properties of Nephrite Jade

  • Hardness: 6.0 - 6.5 on Mohs scale
  • Density: 2.90 - 3.03 g/cm³
  • Color: Green, white, gray, black, yellow, brown
  • Luster: Vitreous to greasy
  • Transparency: Opaque

Uses of Nephrite Jade

Nephrite jade has been used for thousands of years for a wide range of purposes. Some of the most common uses of nephrite jade include:

  • Jewelry: Nephrite jade is often used in jewelry, including necklaces, bracelets, and earrings.
  • Carvings: Nephrite jade is a popular material for carving, and is often used to create figurines, sculptures, and other decorative objects.
  • Tools: Nephrite jade was used to create tools and weapons by many ancient cultures, including the Maori people of New Zealand.
  • Medicinal purposes: In traditional Chinese medicine, nephrite jade was used to treat a variety of ailments, including kidney problems, high blood pressure, and fever.

Caring for Nephrite Jade

To keep your nephrite jade looking its best, it is important to care for it properly. Some tips for caring for nephrite jade include:

  • Avoid exposing your nephrite jade to extreme temperatures.
  • Store your nephrite jade in a soft cloth or pouch to prevent scratches.
  • Clean your nephrite jade with a soft cloth and mild soap. Avoid using harsh chemicals or abrasives.

If you are interested in purchasing nephrite jade, be sure to buy from a reputable dealer. Nephrite jade is often imitated or sold as other materials, so it is important to do your research and buy from a trusted source.

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