fiber optic light
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Fiber-Optic Light in Gemology | Living in the Dark Ages
The role of fiber-optic lighting in gemological microscopy.
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Padparadscha or Pretender | An Unusual Pink-Orange Sapphire
An orangish pink “padparadscha” sapphire was submitted for testing at Lotus Gemology’s Bangkok laboratory. Testing showed a number of conflicting features that suggested the gem was a cleverly treated synthetic pink sapphire designed to imitate natural padparadscha.
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Rutile Silk in Sapphire | Discovery in 1878
In 1878, the noted Austrian mineralogist, Gustav Tschermak von Seysenegg [1836–1927], was the first to properly identify silk in corundum, finding it to be composed of the mineral rutile (TiO2). An English translation of his landmark paper is included, along with the original German version.