Search Gemstone Knowledge
Gemstone Science
Howlite Under Different Lights: Ultraviolet Flu...
Comparing ultraviolet fluorescence and visible-light reflectance on howlite: what each method measures, why their results differ, and the limits of interpreting white, opaque gem materials.
Howlite Under Different Lights: Ultraviolet Flu...
Comparing ultraviolet fluorescence and visible-light reflectance on howlite: what each method measures, why their results differ, and the limits of interpreting white, opaque gem materials.
When a Cat's-Eye Chrysoberyl Defies the Treatme...
A geochemical look at cat's-eye chrysoberyl treatment history, the ambiguity of irradiation-induced color, and the limits of trace-element evidence in gemological diagnosis.
When a Cat's-Eye Chrysoberyl Defies the Treatme...
A geochemical look at cat's-eye chrysoberyl treatment history, the ambiguity of irradiation-induced color, and the limits of trace-element evidence in gemological diagnosis.
Cordierite and the Overreach of the "Color Chan...
Cordierite (iolite) shows strong pleochroism, not automatic colour change. This article examines a common "colour change means irradiation" rule, the narrow real irradiation association in cordierite, and why optical and...
Cordierite and the Overreach of the "Color Chan...
Cordierite (iolite) shows strong pleochroism, not automatic colour change. This article examines a common "colour change means irradiation" rule, the narrow real irradiation association in cordierite, and why optical and...
Why Dyed Agate Fools the Eye: A Crystal-Growth ...
A crystal-growth explanation of dyed agate: how microcrystalline quartz pores and fibrous banding allow dyes to color the stone without changing its mineral structure.
Why Dyed Agate Fools the Eye: A Crystal-Growth ...
A crystal-growth explanation of dyed agate: how microcrystalline quartz pores and fibrous banding allow dyes to color the stone without changing its mineral structure.
When Tourmaline Glows: Reading Luminescence in ...
How manganese and chromium activators, iron quenching, heating, and irradiation affect tourmaline luminescence, and why a glow alone cannot confirm treatment or origin.
When Tourmaline Glows: Reading Luminescence in ...
How manganese and chromium activators, iron quenching, heating, and irradiation affect tourmaline luminescence, and why a glow alone cannot confirm treatment or origin.
Diffusion Treatment in Andalusite: Lattice Modi...
A scientific look at diffusion treatment in andalusite: how lattice structure constrains ion migration, why depth-limited color is analytically difficult to confirm, and how measurement uncertainty shapes treatment attribution.
Diffusion Treatment in Andalusite: Lattice Modi...
A scientific look at diffusion treatment in andalusite: how lattice structure constrains ion migration, why depth-limited color is analytically difficult to confirm, and how measurement uncertainty shapes treatment attribution.