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Gemstone Encyclopedia
Microscopic Evidence in Cultured Pearls: What N...
Explore how microscopic nacre structure controls the physical and optical properties of cultured pearls, and learn what magnification can and cannot prove about pearl identity, origin, and treatment.
Microscopic Evidence in Cultured Pearls: What N...
Explore how microscopic nacre structure controls the physical and optical properties of cultured pearls, and learn what magnification can and cannot prove about pearl identity, origin, and treatment.
Phenakite in Primary and Secondary Deposits: Wh...
Why is gem-quality phenakite mostly found in primary deposits? Learn how phenakite forms in pegmatites and hydrothermal veins, and why secondary placer concentrations are limited.
Phenakite in Primary and Secondary Deposits: Wh...
Why is gem-quality phenakite mostly found in primary deposits? Learn how phenakite forms in pegmatites and hydrothermal veins, and why secondary placer concentrations are limited.
Why Color Zoning in Diamond Is Not Always a Clu...
Diamond color zoning reflects growth and cutting history, not natural origin or geographic source. Learn what zoning can and cannot reveal in gemological identification.
Why Color Zoning in Diamond Is Not Always a Clu...
Diamond color zoning reflects growth and cutting history, not natural origin or geographic source. Learn what zoning can and cannot reveal in gemological identification.
Why Mali Garnet Can Be Mistaken for Other Yello...
Mali garnet is an intermediate grossular-andradite garnet. Learn why its single refraction and dispersion separate it from peridot, zircon, sphene, and other yellow-green gems.
Why Mali Garnet Can Be Mistaken for Other Yello...
Mali garnet is an intermediate grossular-andradite garnet. Learn why its single refraction and dispersion separate it from peridot, zircon, sphene, and other yellow-green gems.
Why "Burmese Ruby" Is a Trade Name, Not a Miner...
Burmese ruby is a geographic trade term, not a mineral variety. Learn how ruby relates to corundum, what chromium does, and why origin requires laboratory testing.
Why "Burmese Ruby" Is a Trade Name, Not a Miner...
Burmese ruby is a geographic trade term, not a mineral variety. Learn how ruby relates to corundum, what chromium does, and why origin requires laboratory testing.
Why Pink Tourmaline Shows Such Wide Clarity and...
Learn why pink tourmaline shows such wide clarity and transparency variation, how specific gravity relates to identification, and why inclusions and growth conditions matter more than density.
Why Pink Tourmaline Shows Such Wide Clarity and...
Learn why pink tourmaline shows such wide clarity and transparency variation, how specific gravity relates to identification, and why inclusions and growth conditions matter more than density.