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Gemstone Encyclopedia
Serendibite: Distinguishing a Rare Mineral Spec...
Serendibite is a natural calcium magnesium aluminum borosilicate mineral. Learn why no established synthetic serendibite exists and how to distinguish natural material from simulants.
Serendibite: Distinguishing a Rare Mineral Spec...
Serendibite is a natural calcium magnesium aluminum borosilicate mineral. Learn why no established synthetic serendibite exists and how to distinguish natural material from simulants.
Why Star Rubies Are Not Always Corundum: Asteri...
Why star ruby is a corundum variety, how crystal structure controls its six-rayed star, and how to distinguish natural star ruby from garnet, quartz, diopside, synthetic corundum, and assembled imitations.
Why Star Rubies Are Not Always Corundum: Asteri...
Why star ruby is a corundum variety, how crystal structure controls its six-rayed star, and how to distinguish natural star ruby from garnet, quartz, diopside, synthetic corundum, and assembled imitations.
Painite and the Problem of Gemstones That Are N...
Painite is a distinct calcium zirconium borate, not a ruby, sapphire, or spinel variety. Learn why its color resembles corundum but its mineral identity and gemological classification do not.
Painite and the Problem of Gemstones That Are N...
Painite is a distinct calcium zirconium borate, not a ruby, sapphire, or spinel variety. Learn why its color resembles corundum but its mineral identity and gemological classification do not.
Why Obsidian Is a Glass, Not a Mineral — and Wh...
Obsidian is a volcanic glass, not a mineral species. Learn why its amorphous structure affects classification, trade names, physical properties, and geological rarity.
Why Obsidian Is a Glass, Not a Mineral — and Wh...
Obsidian is a volcanic glass, not a mineral species. Learn why its amorphous structure affects classification, trade names, physical properties, and geological rarity.
Fire Agate Color and Cabochon Cutting: Why the ...
Why is fire agate cut as a cabochon? Learn how thin-film interference in layered silica and iron oxide creates its iridescent color and why faceting would destroy it.
Fire Agate Color and Cabochon Cutting: Why the ...
Why is fire agate cut as a cabochon? Learn how thin-film interference in layered silica and iron oxide creates its iridescent color and why faceting would destroy it.
Why Brazilian Emerald Crystals Rarely Look Like...
Why Brazilian emerald often shows irregular, etched crystals instead of clean hexagonal prisms, and why habit reflects geology rather than origin identity.
Why Brazilian Emerald Crystals Rarely Look Like...
Why Brazilian emerald often shows irregular, etched crystals instead of clean hexagonal prisms, and why habit reflects geology rather than origin identity.