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Gemstone Encyclopedia
Why Some Moldavite Is Cut as a Cabochon: Inclus...
Some moldavite specimens are cut as cabochons rather than faceted stones. Learn how internal strain, fracture, bubbles, and optical behavior explain the choice of cutting style.
Why Some Moldavite Is Cut as a Cabochon: Inclus...
Some moldavite specimens are cut as cabochons rather than faceted stones. Learn how internal strain, fracture, bubbles, and optical behavior explain the choice of cutting style.
Sapphire and Synthetic Corundum: Why Species an...
Sapphire is a variety of corundum, not a mineral species. Learn how that distinction shapes synthetic sapphire classification, lookalike identification, and gemological testing.
Sapphire and Synthetic Corundum: Why Species an...
Sapphire is a variety of corundum, not a mineral species. Learn how that distinction shapes synthetic sapphire classification, lookalike identification, and gemological testing.
Chrome Tourmaline and the Vanadium Question: Wh...
Chrome tourmaline is usually named for color, not chemistry. Learn how chromium and vanadium produce green in tourmaline and why the trade term can mislead.
Chrome Tourmaline and the Vanadium Question: Wh...
Chrome tourmaline is usually named for color, not chemistry. Learn how chromium and vanadium produce green in tourmaline and why the trade term can mislead.
Why Kornerupine Rarely Shows Useful Color Chang...
Kornerupine can show a weak color change, but it is easily confused with pleochroism. Learn the optical reasons, why cut orientation matters, and why most stones show little effect.
Why Kornerupine Rarely Shows Useful Color Chang...
Kornerupine can show a weak color change, but it is easily confused with pleochroism. Learn the optical reasons, why cut orientation matters, and why most stones show little effect.
Why Dendritic Agate Shows No Play of Color: Int...
Dendritic agate shows inclusion patterns, not play of color. Learn why interference effects require periodic nanostructure, how specific gravity fits into identification, and how to distinguish dendritic agate from iridescent...
Why Dendritic Agate Shows No Play of Color: Int...
Dendritic agate shows inclusion patterns, not play of color. Learn why interference effects require periodic nanostructure, how specific gravity fits into identification, and how to distinguish dendritic agate from iridescent...
Peridot's Diagnostic Profile: What Its Properti...
Peridot's diagnostic properties reflect its identity as gem-quality olivine. Learn how birefringence, refractive index, iron-driven color, and inclusions help identify peridot and interpret its igneous or metamorphic origin.
Peridot's Diagnostic Profile: What Its Properti...
Peridot's diagnostic properties reflect its identity as gem-quality olivine. Learn how birefringence, refractive index, iron-driven color, and inclusions help identify peridot and interpret its igneous or metamorphic origin.