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Gemstone Encyclopedia
How Trace Elements and Structural Water Shape t...
How trace elements, structural water, and silica-sphere diffraction explain the body color and play-of-color of crystal opal, with gemological identification limits.
How Trace Elements and Structural Water Shape t...
How trace elements, structural water, and silica-sphere diffraction explain the body color and play-of-color of crystal opal, with gemological identification limits.
Why Gem-Quality Moonstone Is Geologically Rare
Gem-quality moonstone is geologically rare because feldspar abundance does not guarantee adularescent, clean, cuttable crystals. Learn the formation and classification reasons.
Why Gem-Quality Moonstone Is Geologically Rare
Gem-quality moonstone is geologically rare because feldspar abundance does not guarantee adularescent, clean, cuttable crystals. Learn the formation and classification reasons.
Why Emerald's Hardness Rating Can Be Misleading...
Why emerald's Mohs hardness is misleading, how inclusions and fractures affect Zambian emerald durability, and why hardness is not the same as toughness.
Why Emerald's Hardness Rating Can Be Misleading...
Why emerald's Mohs hardness is misleading, how inclusions and fractures affect Zambian emerald durability, and why hardness is not the same as toughness.
Ceylon Sapphire Rarity: What Actually Limits Su...
Ceylon sapphire is a trade name, not a rarity guarantee. Learn why Sri Lanka produces abundant corundum but very little gem-quality blue sapphire, and what actually limits supply.
Ceylon Sapphire Rarity: What Actually Limits Su...
Ceylon sapphire is a trade name, not a rarity guarantee. Learn why Sri Lanka produces abundant corundum but very little gem-quality blue sapphire, and what actually limits supply.
Moldavite: A Tektite, Not a Mineral—And Why Tha...
Moldavite is a natural glass tektite, not a mineral. Learn its composition, formation, gemological properties, lookalikes, and why it cannot be identified by simple home tests.
Moldavite: A Tektite, Not a Mineral—And Why Tha...
Moldavite is a natural glass tektite, not a mineral. Learn its composition, formation, gemological properties, lookalikes, and why it cannot be identified by simple home tests.
Why Phenakite Is Never Treated: A Lesson in Gem...
Phenakite is a rare beryllium silicate that is never treated. Learn the geological and gemological reasons why this mineral resists common treatments and how that affects identification.
Why Phenakite Is Never Treated: A Lesson in Gem...
Phenakite is a rare beryllium silicate that is never treated. Learn the geological and gemological reasons why this mineral resists common treatments and how that affects identification.