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Gemstone Encyclopedia
How Black Tourmaline Needles Form Inside Quartz...
Tourmalinated quartz is a quartz-tourmaline intergrowth, not one mineral. Learn how needle density, thickness, refractive contrast, and growth timing explain clarity variation.
How Black Tourmaline Needles Form Inside Quartz...
Tourmalinated quartz is a quartz-tourmaline intergrowth, not one mineral. Learn how needle density, thickness, refractive contrast, and growth timing explain clarity variation.
Why South Sea Pearls Usually Show No Fluorescen...
South Sea pearls usually show weak or no fluorescence under longwave UV. Learn why nacre's aragonite and conchiolin structure limits luminescence and how gemologists interpret the reaction.
Why South Sea Pearls Usually Show No Fluorescen...
South Sea pearls usually show weak or no fluorescence under longwave UV. Learn why nacre's aragonite and conchiolin structure limits luminescence and how gemologists interpret the reaction.
Nephrite or Jadeite? Reading the Difference Und...
Nephrite is a fibrous amphibole aggregate, jadeite a granular pyroxene mosaic. This gemological guide explains why microscope texture and key properties separate the two materials called jade.
Nephrite or Jadeite? Reading the Difference Und...
Nephrite is a fibrous amphibole aggregate, jadeite a granular pyroxene mosaic. This gemological guide explains why microscope texture and key properties separate the two materials called jade.
Iolite Fluorescence, Phosphorescence, and the P...
Natural iolite is usually non-fluorescent, but bright fluorescence does not prove synthetic iolite. Learn what luminescence can and cannot reveal about iolite identification.
Iolite Fluorescence, Phosphorescence, and the P...
Natural iolite is usually non-fluorescent, but bright fluorescence does not prove synthetic iolite. Learn what luminescence can and cannot reveal about iolite identification.
How Density and Crystal Growth Structure Explai...
How density and specific gravity vary within the apatite mineral group, and why growth zoning and internal patterns record the same compositional changes that affect a gem's weight.
How Density and Crystal Growth Structure Explai...
How density and specific gravity vary within the apatite mineral group, and why growth zoning and internal patterns record the same compositional changes that affect a gem's weight.
Phenakite Under the Balance: What Specific Grav...
Why phenakite's density and refractive index separate it from quartz, beryl, and topaz, and what specific gravity cannot reveal about natural versus synthetic origin.
Phenakite Under the Balance: What Specific Grav...
Why phenakite's density and refractive index separate it from quartz, beryl, and topaz, and what specific gravity cannot reveal about natural versus synthetic origin.