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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Blue Topaz discover from Amazon rainforest

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 The Blue Topaz, weighing 2 kilograms and boasting a remarkable cut of 9,381 carats, was unearthed in the 1980s within the depths of the Amazon rainforest by the intrepid British explorer, Max Ostro. Ever since its discovery, this precious jewel has been securely stored away in a safe.

Big size blue topaz
Big size Topaz from Amazon rainforest


Experts have deemed this Topaz gem to be of such extraordinary worth that its value is deemed immeasurable, surpassing the million-pound mark.

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