Gemstone Formation & Geology
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How gemstones form deep within the Earth and reach the surface. Explore the geological processes — from volcanic eruptions to metamorphic pressure — that create the world's most beautiful crystals.
advancedHow Diamonds Form Deep in the Earth
From 150 kilometers below to your jewelry box
How Rubies and Sapphires Form
Same mineral, different colors — the geology of corundum
Volcanic Gemstones: Gems Born From Lava
Peridot, obsidian, and the gems that ride magma to the surface
Metamorphic Gemstones Explained
How heat and pressure transform ordinary rock into precious gems
How Opals Form: Fire From Water
The only gemstone born from ancient groundwater
Organic Gems: Pearls, Amber, and Coral
Gemstones produced by living organisms, not geological processes
Pegmatite Gems: Nature's Treasure Chests
The geological environments that produce the world's largest and rarest crystals
Alluvial Mining: Gemstones From Rivers
How rivers concentrate gems and why alluvial stones are often the finest