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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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Easy MCQS

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Quartz MCQs Quiz Submit Answer Further reading Gemology MCQs Part-1 Introduction quiz
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Free Courses: Register yourself now! The last date for registration is 14.01.2024.

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  Required for the sign-up form (Please first read carefully.) Your name according to your CNIC card CNIC or POR card number. Email address Mobile No. (Select your network, for example, U-Fone, Warid, Telenor, etc.)                    User Name & Password Your CNIC / POR card number  is your user name (which will be later required to sign in on the page for course selection) Password (as you desire) please write or save this password later; it will be required for the sign-in page. Here is the Sign-up link Sign up Page ☝ When you click on the sign-up page, you will see the following interface: Fill in blank spaces. But some time, direct-open the sign-in page, then directly click on the candidate button as highlighted at the bottom of the sign-in page.              ☝Here is the candidate button for registration   For free...
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Birthstone calculator

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Here is a simple tool. With the help of this tool, someone can easily calculate his or her birthstone. Just enter your date of birth and press the calculate button, and you will find your birthstone name. If you like, please share with your friends. Birthstone Calculator Birthstone Calculator Select your birthdate: Calculate Further reading What is birthstone? How effect it in human life and how to choose the right birthstone ?
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Gemology Hub / Gems Hub / Minerals Hub: A Simple Test for Identification of Natural Tenebr...

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Gemology Hub / Gems Hub / Minerals Hub: A Simple Test for Identification of Natural Tenebr... : I originally composed this laboratory alert note in December 2013 using a PowerPoint presentation.. However, I now want to share it on socia...
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A Simple Test for Identification of Natural Tenebrescent Scapolite and Irradiated Tenebrescent Scapolite

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I originally composed this laboratory alert note in December 2013 using a PowerPoint presentation.. However, I now want to share it on social media platforms to effectively distribute the information in a simple way. With the help of this simple, effective test, geologists, mineralogists, gemologists, and people involved in the gemstone business can effortlessly differentiate between natural untreated tenebrescent scapolite and irradiated tenebrescent scapolite. Here is the link below  simple test for identification of natural untreated tenebrescent scapolite and irradiated scapolite ☝ Further reading What is Fluorescence, Phosphorescence, Tenebrescent? Hackmanite Details
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What are Native Elements?

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Native elements are minerals that consist of a single element, existing in a pure form without any chemical bonds to other elements. These minerals serve a multitude of purposes, ranging from the creation of exquisite jewelry and decorative items like gold and silver, to their application in industrial settings, such as platinum in catalytic converters. Moreover, native elements hold great scientific and research value. These minerals can be naturally found in a variety of geological environments, including igneous rocks, hydrothermal veins, and alluvial deposits. They often accompany specific mineral deposits, offering vital insights into the geological processes that led to their formation. Some well-known examples of native elements  are  Gold (Au) Silver (Ag) Copper (Cu) Platinum (Pt) Diamond (C) summary  Native elements are minerals that consist of a single element, existing in a pure form. They possess diverse applications and scientific significance, and can be d...
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Cuprite Details

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  Cuprite Cuprite is a mineral composed of copper oxide with the chemical formula Cu 2 O. It is a primary ore of copper and is usually found in oxidized copper ore veins . Below are some physical and optical properties, occurrence by country, healing properties, and uses of cuprite: Discovery Cuprite was first described in 1845 from the Ural Mountains, Russia . Physical Properties Color: Red to dark red, sometimes with a blackish tint Crystal System: Isometric Cleavage: None Fracture: Conchoidal Hardness: 3.5-4 Specific Gravity: 5.85-6.15 Luster: Adamantine to sub-metallic Optical Properties Refractive Index: 2.849-3.410 Birefringence: None Pleochroism: None Dispersion: 0.080 Occurrence by Country Chile Peru USA Mexico Zambia Russia Australia Namibia South Africa Healing Properties Cuprite is believed to have the following healing properties: Boosts creativity Encourages positive thinking Enhances intuition Stimulates the imagination Increases self-awareness Boosts energy levels...
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