Everything Everywhere Daily: History, Science, Geography, & More Gemstones (Encore)
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Oct 5, 2025 Explore the fascinating world of gemstones, from the ancient allure of diamonds to the vibrant hues of rubies and sapphires. Discover how amethysts lost their precious status and what makes opals uniquely beautiful. Delve into the historical significance of lapis lazuli and jade in different cultures, and learn how birthstones evolved through time. The podcast also uncovers the effects of modern trade on gemstone accessibility and the rise of synthetic gems, making these treasures more available to everyone.
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Why Rubies Are Red
- Rubies are gem-quality corundum colored red by chromium impurities, while corundum itself is aluminum oxide.
- Historically sourced from Myanmar and Thailand, recent finds include Madagascar, Kenya, and Tanzania.
Sapphire And Color Continuum
- Sapphires are also corundum but get blue (or other) colors from titanium and trace elements rather than chromium.
- The color continuum means pink stones can be classed as either ruby or sapphire depending on hue.
Emeralds Are Colored Beryl
- Emeralds are green, gem-quality beryl colored by chromium or vanadium impurities within beryl's beryllium-aluminum-silicate structure.
- Ancient Egypt, India, and Austria mined emeralds historically; Colombia is a major modern source.
