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Gemstone Encyclopedia
Can Opal Be Grown in a Laboratory? Synthetic Op...
Can opal be grown in a laboratory? Learn how synthetic opal is made from silica microspheres, how it differs from imitation and treated opal, and why the word synthetic is...
Can Opal Be Grown in a Laboratory? Synthetic Op...
Can opal be grown in a laboratory? Learn how synthetic opal is made from silica microspheres, how it differs from imitation and treated opal, and why the word synthetic is...
How Cultured Pearls Form: Nacre Deposition and ...
How cultured pearls form through nacre deposition around a bead or tissue implant, and why X-radiography and magnification reveal the internal structures that distinguish them from natural pearls and imitations.
How Cultured Pearls Form: Nacre Deposition and ...
How cultured pearls form through nacre deposition around a bead or tissue implant, and why X-radiography and magnification reveal the internal structures that distinguish them from natural pearls and imitations.
When a Sapphire Star Is Not a Sapphire Growth F...
Star sapphire forms from oriented inclusions in corundum, not from the crystal structure alone. Learn how natural and synthetic star sapphires differ in growth features, inclusions, and identification.
When a Sapphire Star Is Not a Sapphire Growth F...
Star sapphire forms from oriented inclusions in corundum, not from the crystal structure alone. Learn how natural and synthetic star sapphires differ in growth features, inclusions, and identification.
Chrome Diopside and the Illusion of Iridescence
Chrome diopside is a chromium-colored diopside variety, not a play-of-color gem. Learn why interference-like reflections are secondary and why gem-quality crystals are uncommon.
Chrome Diopside and the Illusion of Iridescence
Chrome diopside is a chromium-colored diopside variety, not a play-of-color gem. Learn why interference-like reflections are secondary and why gem-quality crystals are uncommon.
Why Imperial Topaz Usually Glows Under UV but S...
Imperial topaz may fluoresce under longwave UV, but many genuine stones stay inert. Learn how trace elements, oxidation state, and heat treatment control topaz luminescence and why UV is not...
Why Imperial Topaz Usually Glows Under UV but S...
Imperial topaz may fluoresce under longwave UV, but many genuine stones stay inert. Learn how trace elements, oxidation state, and heat treatment control topaz luminescence and why UV is not...
Demantoid Garnet Inclusions: What Horsetail and...
Learn how horsetail fibers and other inclusions in demantoid garnet form, what they reveal about natural origin, and why they are useful clues but not definitive tests.
Demantoid Garnet Inclusions: What Horsetail and...
Learn how horsetail fibers and other inclusions in demantoid garnet form, what they reveal about natural origin, and why they are useful clues but not definitive tests.