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Gemstone Encyclopedia
Amazonite vs. Treated Feldspars: How Enhancemen...
How dyeing, impregnation, heating, and other treatments can make other minerals resemble amazonite, and the gemological methods used to distinguish true microcline amazonite from treated feldspar lookalikes.
Amazonite vs. Treated Feldspars: How Enhancemen...
How dyeing, impregnation, heating, and other treatments can make other minerals resemble amazonite, and the gemological methods used to distinguish true microcline amazonite from treated feldspar lookalikes.
Phenomenal Pyrite: Iridescence and Its Laborato...
Discover what creates rainbow colors on pyrite surfaces, how natural iridescence differs from coatings, and why synthetic pyrite is not a common gem material.
Phenomenal Pyrite: Iridescence and Its Laborato...
Discover what creates rainbow colors on pyrite surfaces, how natural iridescence differs from coatings, and why synthetic pyrite is not a common gem material.
When Fluorescence Misleads: Watermelon Tourmali...
Understand why fluorescence cannot reliably identify watermelon tourmaline. Learn about color zoning, trace elements, and the limits of visual gemological identification.
When Fluorescence Misleads: Watermelon Tourmali...
Understand why fluorescence cannot reliably identify watermelon tourmaline. Learn about color zoning, trace elements, and the limits of visual gemological identification.
Why Some Nephrite Shows Stronger Chatoyancy: Op...
Discover why certain nephrite jade displays a cat's-eye effect. Learn how parallel tremolite-actinolite fibers, crystal size, transparency, and cutting orientation control chatoyancy strength.
Why Some Nephrite Shows Stronger Chatoyancy: Op...
Discover why certain nephrite jade displays a cat's-eye effect. Learn how parallel tremolite-actinolite fibers, crystal size, transparency, and cutting orientation control chatoyancy strength.
Fluorite’s Many Faces: From Blue John to Antozo...
Learn about fluorite variety names, including Blue John and antozonite, and why many are historical or trade terms rather than formal mineral types. Understand the role of color, fluorescence, and...
Fluorite’s Many Faces: From Blue John to Antozo...
Learn about fluorite variety names, including Blue John and antozonite, and why many are historical or trade terms rather than formal mineral types. Understand the role of color, fluorescence, and...
Carnelian Under the Lens: How Heat Treatment Co...
Understand how heating carnelian changes its color and why that complicates gemological identification. Learn the difference between heated, unheated, and dyed chalcedony.
Carnelian Under the Lens: How Heat Treatment Co...
Understand how heating carnelian changes its color and why that complicates gemological identification. Learn the difference between heated, unheated, and dyed chalcedony.