So, rocks are hard. But the scale we use to rank them, the Mohs scale, is only really good at quantifying that for one kind of hardness, and topaz is a perfect stone to talk about to explain that. And you can check it out in our SciShow...

Montana sapphires come in a beautiful array of colors found in a few other places in the world. But geologists have no idea where they originated.<br/>

Gems are more than just pretty rocks! Hosted by: Michael Aranda

Howcast -Learn about alternatives to diamonds for engagement rings from private jeweler Kate Hemphill in this Howcast video.

Discover the specific conditions needed for the formation of emeralds, rubies and sapphires; and how there is now potential to 'grow' them in laboratories. Earth Science - Geology - Learning Points. Emeralds are made from beryllium....

Discover the dangers faced by workers in Madagascar's illegal sapphire mines. And why inequalities in the global trade of the gems mean others profit most from the miners' work... Human Geography - A Changing World - Learning Points....

Six objects are shown on screen ... can you spot the minerals?
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Material processes - Classifying materi
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Learning Points
A range


of minerals can be found on Earth.
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In this lesson, you will be learning a set of good techniques to use Blender to your advantage to create gemstones. We will be making blue, golden, and silver gems.

Facebook is working with aeronautics company Airbus on drone-based connectivity, according to German publication Netzpolitik.

Explore how gemstones get their colors. We learn that gemstones absorb and reflect certain light waves based on their chemical structures, resulting in different colors. Some gemstones are self-colored, while others are colored by...