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pleochroism    
多色性; 多向色性; 复色现象

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  • Pleochroism in Faceted Gems: An Introduction | Gems Gemology - GIA
    Describes the phenomenon of pleochroism and its complex effect on the appearance of colored stones
  • Special Colors and Optical Effects of Oregon Sunstone: Absorption . . .
    ABSTRACT Oregon sunstone is a unique feldspar gemstone that displays a wide range of colors and optical effects due to the presence of metallic copper inclusions of various sizes and shapes Most striking are the distinct green and red colors caused by copper particles, sometimes with strong red to green pleochroism Recent computation work suggests that copper particles can strongly absorb
  • Pleochroism and Color Change in Faceted Alexandrite: Influence of . . . - GIA
    The color appearance of faceted gemstones is a complex subject, and the challenges are increased if the material is biaxial and pleochroism is added to the considerations For alexandrite in particular, the quest for a beautiful cut gem is further intensified by efforts to achieve the “best
  • Pleochroism in Faceted Gems: An Introduction - GIA
    Figure 1 Pleochroism in a 15 ct tanzanite, as seen with the unaided eye through the crown and the pavilion sides and ends Photo by Wimon Manorotkul ABSTRACT While virtually all gemological texts cover pleochroism, it is almost always related to viewing with a dichroscope Exactly how pleochroism manifests itself in faceted gems is largely ignored This article discusses this phenomenon in
  • Fall 2023 Gems Gemology Special Colors and Optical Effects of Oregon . . .
    Oregon sunstone is a unique feldspar gemstone that displays a wide range of colors and optical effects due to the pres-ence of metallic copper inclusions of various sizes and shapes Most striking are the distinct green and red colors caused by copper particles, sometimes with strong red to green pleochroism Recent computation work suggests that copper particles can strongly absorb and or
  • Pleochroism And Color Change In Faceted Alexandrite: Influence Of Cut . . .
    The color appearance of faceted gemstones is a complex subject, and the challenges are increased if the material is biaxial and pleochroism is added to the considerations For alexandrite in particular, the quest for a beautiful cut gem is further intensified by efforts to achieve the “best” color change As an optically biaxial material, alexandrite possesses three different vibration
  • Tanzanite Description - GIA
    Tanzanite's appearance is influenced greatly by its pleochroism, which is the ability of a gemstone to show different colors when viewed in different crystal directions
  • Iolite Description - GIA
    Iolite’s strong pleochroism makes the gem tricky to cut for best color This in turn continues to pose challenges to producers and buyers interested in promoting the attractive yet problematic gem to retailers as an affordable blue-gem alternative In the hands of a skilled cutter, iolite’s beauty can be revealed
  • Iolite Gemstone | Iolite Stone – GIA
    Iolite gemstone is the gem-quality variety of the mineral cordierite In shifting shades of violet blue, it carries the spirit of journey illumination
  • GIAs Gübelin Gem Project: Tourmaline
    Among the many varieties of elbaite tourmaline are verdelite (green), indicolite (blue) and rubellite (red) Some tourmaline specimens display multiple colors Optical effects include pleochroism (a change of color when the gemstone is rotated) and chatoyancy (a “cat’s-eye” seen in reflected light)





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