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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Rock Crystal Details

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Rock Crystal

Rock Crystal

Meaning: Rock crystal is the clear variety of quartz crystal, also known as pure quartz or clear quartz. It is one of the most common minerals on Earth and can be found in many different geological environments.

History: Rock crystal has been used for thousands of years in jewelry, decorative objects, and religious artifacts. It was highly valued by the ancient Greeks and Romans, who believed that it had healing properties and could provide protection from harm.

Physical Properties: Rock crystal has a hardness of 7 on the Mohs scale and a specific gravity of 2.65. It is transparent to translucent with a vitreous luster and can be colorless, white, or slightly tinted.

Optical Properties: Rock crystal has a refractive index of 1.54 to 1.55 and a birefringence of 0.009. It is uniaxial and optically positive.

Healing Properties: Rock crystal is believed to have many healing properties, including the ability to amplify energy, enhance memory and concentration, and promote spiritual growth. It is also said to be a stone of clarity and purity.

Birthstone: Rock crystal is not a traditional birthstone, but it is the astrological birthstone for Aries.

Occurrence: Rock crystal can be found all over the world, with major deposits in Brazil, Madagascar, the United States, and Switzerland.

Uses: Rock crystal is used in a variety of ways, including as a gemstone in jewelry, as a decorative object, and in the production of electronic devices and equipment.


Turkish Rings 

John Hardy Women's Legends Naga Gold & Silver Dragon Station Chain Bracelet
John Hardy Women's Legends Naga Gold & Silver Dragon Station Chain Bracelet

Solid Gold Petite Micropave
Solid Gold Petite Micropave

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