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Gemstone Encyclopedia
Pyrite and the Limits of Chatoyancy: When Metal...
Pyrite may show directional sheen, but true chatoyancy requires translucency and internal reflection. Learn why an opaque metallic sulfide cannot produce a movable cat's-eye.
Pyrite and the Limits of Chatoyancy: When Metal...
Pyrite may show directional sheen, but true chatoyancy requires translucency and internal reflection. Learn why an opaque metallic sulfide cannot produce a movable cat's-eye.
Why Red Beryl Fluoresces and Why the Reaction I...
Red beryl fluorescence is a manganese-related luminescence effect, but it is not a reliable identification test. Learn how body color, fluorescence, phosphorescence, and trace-element quenching differ in this rare beryl...
Why Red Beryl Fluoresces and Why the Reaction I...
Red beryl fluorescence is a manganese-related luminescence effect, but it is not a reliable identification test. Learn how body color, fluorescence, phosphorescence, and trace-element quenching differ in this rare beryl...
Rainbow Moonstone and Labradorite: Why One Name...
Rainbow moonstone is typically labradorite, a plagioclase feldspar, not alkali feldspar moonstone. Learn why the trade name misleads and how labradorescence differs from adularescence.
Rainbow Moonstone and Labradorite: Why One Name...
Rainbow moonstone is typically labradorite, a plagioclase feldspar, not alkali feldspar moonstone. Learn why the trade name misleads and how labradorescence differs from adularescence.
How Crystal Habit in Pink Tourmaline Reveals Gr...
Explore how crystal habit, growth zoning, and inclusions in pink tourmaline distinguish natural elbaite from flux-grown synthetic material.
How Crystal Habit in Pink Tourmaline Reveals Gr...
Explore how crystal habit, growth zoning, and inclusions in pink tourmaline distinguish natural elbaite from flux-grown synthetic material.
Why Rhodochrosite Is Manganese Carbonate, Not a...
Rhodochrosite is a manganese carbonate mineral in the calcite group. Learn why its composition, crystal structure, and geological occurrence explain its color, density, habit, and gem trade uses.
Why Rhodochrosite Is Manganese Carbonate, Not a...
Rhodochrosite is a manganese carbonate mineral in the calcite group. Learn why its composition, crystal structure, and geological occurrence explain its color, density, habit, and gem trade uses.
Reading Tahitian Pearl Surfaces Against Those o...
Explore the internal and surface features of Tahitian pearls, including nacre layering, blemishes, and X-ray-visible nuclei, and learn how they differ from South Sea and Akoya cultured pearls.
Reading Tahitian Pearl Surfaces Against Those o...
Explore the internal and surface features of Tahitian pearls, including nacre layering, blemishes, and X-ray-visible nuclei, and learn how they differ from South Sea and Akoya cultured pearls.