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Shape tells the story: how to read a mineral by its crystal habit
Learn to read a mineral by its outer shape: what crystal habit tells you about how, where and how fast each stone formed.
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Tourmaline comes in far more than just black
Pink, green, blue, black, watermelon... each color is the result of a different chemical composition. The same mineral, endless possibilities.
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Emerald, sapphire, ruby. Raw and cut. Same stones, two prices.
An emerald can cost €3 or €30,000. It's the same mineral: what changes is whether the crystal is transparent or not.
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What determines the value of a mineral?
The value of a mineral isn't in its name. It's in how it formed, and in how unlikely it is that nature created exactly that piece.
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Uruguayan amethyst: small points and deep violet. Brazilian: large and lighter. Why?
Why does natural amethyst from Uruguay have small points and such a deep violet, while natural amethyst from Brazil has large crystals and a lighter colour? We explain it all here.
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Is obsidian a mineral? The answer might surprise you
Obsidian is one of nature's most fascinating stones… and it turns out it's technically not a mineral. Find out what it really is, why, and the curiosities that make it truly unique.
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Red Jasper, Sardonyx, Picture, Leopard, Dalmatian... Why Are There So Many Types of Jasper?
Red jasper, sardonyx, picture, leopard, Dalmatian... are these different stones or variations of the same one? We break it down simply.
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Quartz vs White Quartz vs Rock Crystal: What's the Difference?
Everything you need to know about quartz, white quartz and rock crystal: why they get confused so often and what really sets them apart.
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Pink amethyst: a new stone with a lot to tell
Everything we know — and what is still debated — about pink amethyst: its colour, its origin and why it is so different from rose quartz.
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